Add distance array benchmarks

[PardhavMaradani]

Fixes #176

This PR adds distance array and self distance array benchmarks.

(I wanted to try out distance array methods with distopia+OpenMP (discussion #189) and noticed these benchmarks missing)

Show benchmark run

$ ./bench --benchmark_filter="DistanceArray" 
2026-04-05T07:07:52+05:30
Running ./bench
Run on (8 X 2217.28 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x4)
  L1 Instruction 32 KiB (x4)
  L2 Unified 256 KiB (x4)
  L3 Unified 8192 KiB (x1)
Load Average: 0.75, 0.91, 0.94
--------------------------------------------------------------------------------------------------------------------------------------------------
Benchmark                                                                                        Time             CPU   Iterations UserCounters...
--------------------------------------------------------------------------------------------------------------------------------------------------
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxMDAFloat/100/100/0                     6340 ns         6341 ns       108355 Per Result=634.05ps items_per_second=1.57716G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxMDAFloat/10000/100/0                 637532 ns       637518 ns         1065 Per Result=637.518ps items_per_second=1.56858G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxMDAFloat/100/10000/0                 634637 ns       634640 ns         1074 Per Result=634.64ps items_per_second=1.5757G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxMDAFloat/10000/10000/0             78146201 ns     78140140 ns            8 Per Result=781.401ps items_per_second=1.27975G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxMDADouble/100/100/0                   7235 ns         7234 ns        96564 Per Result=723.431ps items_per_second=1.3823G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxMDADouble/10000/100/0               735335 ns       735326 ns          910 Per Result=735.326ps items_per_second=1.35994G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxMDADouble/100/10000/0               817475 ns       817468 ns          820 Per Result=817.468ps items_per_second=1.22329G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxMDADouble/10000/10000/0          127866987 ns    127864344 ns            5 Per Result=1.27864ns items_per_second=782.079M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxFloat/100/100/0                        3279 ns         3279 ns       213531 Per Result=327.861ps items_per_second=3.05007G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxFloat/10000/100/0                    325264 ns       325250 ns         2153 Per Result=325.25ps items_per_second=3.07456G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxFloat/100/10000/0                    409260 ns       409242 ns         1714 Per Result=409.242ps items_per_second=2.44354G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayNoBoxFloat/10000/10000/0                56596899 ns     56595671 ns           11 Per Result=565.957ps items_per_second=1.76692G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxDouble/100/100/0                      7193 ns         7193 ns        96983 Per Result=719.284ps items_per_second=1.39027G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxDouble/10000/100/0                  724529 ns       724485 ns          925 Per Result=724.485ps items_per_second=1.38029G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxDouble/100/10000/0                  804074 ns       804083 ns          825 Per Result=804.083ps items_per_second=1.24365G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayNoBoxDouble/10000/10000/0             128667280 ns    128656427 ns            5 Per Result=1.28656ns items_per_second=777.264M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoMDAFloat/100/100/0                    88695 ns        88693 ns         7737 Per Result=8.86932ns items_per_second=112.748M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoMDAFloat/10000/100/0                8854672 ns      8854478 ns           79 Per Result=8.85448ns items_per_second=112.937M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoMDAFloat/100/10000/0                9100998 ns      9098791 ns           79 Per Result=9.09879ns items_per_second=109.905M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoMDAFloat/10000/10000/0           1005422920 ns   1005402349 ns            1 Per Result=10.054ns items_per_second=99.4627M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoMDADouble/100/100/0                 144515 ns       144515 ns         4968 Per Result=14.4515ns items_per_second=69.197M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoMDADouble/10000/100/0             14482316 ns     14482238 ns           48 Per Result=14.4822ns items_per_second=69.0501M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoMDADouble/100/10000/0             14519801 ns     14519432 ns           48 Per Result=14.5194ns items_per_second=68.8732M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoMDADouble/10000/10000/0         1699215215 ns   1699211337 ns            1 Per Result=16.9921ns items_per_second=58.8508M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoFloat/100/100/0                        6286 ns         6285 ns       111901 Per Result=628.542ps items_per_second=1.59098G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoFloat/10000/100/0                    627713 ns       627639 ns         1112 Per Result=627.639ps items_per_second=1.59327G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoFloat/100/10000/0                    736903 ns       736801 ns          945 Per Result=736.801ps items_per_second=1.35722G/s
DistanceArrayCoordinatesBench<float>/DistanceArrayOrthoFloat/10000/10000/0                76369095 ns     76367459 ns            8 Per Result=763.675ps items_per_second=1.30946G/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoDouble/100/100/0                     12660 ns        12658 ns        54764 Per Result=1.26578ns items_per_second=790.024M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoDouble/10000/100/0                 1118335 ns      1118324 ns          609 Per Result=1.11832ns items_per_second=894.195M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoDouble/100/10000/0                 1414570 ns      1414391 ns          481 Per Result=1.41439ns items_per_second=707.018M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayOrthoDouble/10000/10000/0             185085390 ns    185083991 ns            3 Per Result=1.85084ns items_per_second=540.295M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicMDAFloat/100/100/0               428145 ns       428124 ns         1627 Per Result=42.8124ns items_per_second=23.3577M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicMDAFloat/10000/100/0           42716275 ns     42716024 ns           16 Per Result=42.716ns items_per_second=23.4104M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicMDAFloat/100/10000/0           42033687 ns     42034031 ns           17 Per Result=42.034ns items_per_second=23.7902M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicMDAFloat/10000/10000/0       4417270546 ns   4417215077 ns            1 Per Result=44.1722ns items_per_second=22.6387M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicMDADouble/100/100/0             437602 ns       437599 ns         1580 Per Result=43.7599ns items_per_second=22.852M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicMDADouble/10000/100/0         44061869 ns     44061986 ns           16 Per Result=44.062ns items_per_second=22.6953M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicMDADouble/100/10000/0         43247608 ns     43247943 ns           16 Per Result=43.2479ns items_per_second=23.1225M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicMDADouble/10000/10000/0     4616607787 ns   4616559633 ns            1 Per Result=46.1656ns items_per_second=21.6612M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicFloat/100/100/0                   78281 ns        78274 ns         8837 Per Result=7.82743ns items_per_second=127.756M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicFloat/10000/100/0               7841649 ns      7841162 ns           88 Per Result=7.84116ns items_per_second=127.532M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicFloat/100/10000/0               7706354 ns      7706177 ns           90 Per Result=7.70618ns items_per_second=129.766M/s
DistanceArrayCoordinatesBench<float>/DistanceArrayTriclinicFloat/10000/10000/0           854459764 ns    854433681 ns            1 Per Result=8.54434ns items_per_second=117.037M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicDouble/100/100/0                154949 ns       154925 ns         4506 Per Result=15.4925ns items_per_second=64.5474M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicDouble/10000/100/0            15362679 ns     15362250 ns           45 Per Result=15.3623ns items_per_second=65.0946M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicDouble/100/10000/0            15817443 ns     15817352 ns           44 Per Result=15.8174ns items_per_second=63.2217M/s
DistanceArrayCoordinatesBench<double>/DistanceArrayTriclinicDouble/10000/10000/0        1719210473 ns   1719177373 ns            1 Per Result=17.1918ns items_per_second=58.1674M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxMDAFloat/10/0/0                61.4 ns         61.4 ns     11232558 Per Result=614.094ps items_per_second=1.62842G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxMDAFloat/100/0/0               3598 ns         3598 ns       194613 Per Result=359.811ps items_per_second=2.77923G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxMDAFloat/1000/0/0            336123 ns       336120 ns         2081 Per Result=336.12ps items_per_second=2.97513G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxMDAFloat/10000/0/0         37029169 ns     37028831 ns           18 Per Result=370.288ps items_per_second=2.7006G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxMDADouble/10/0/0              55.3 ns         55.3 ns     12371801 Per Result=552.764ps items_per_second=1.80909G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxMDADouble/100/0/0             4147 ns         4147 ns       169041 Per Result=414.735ps items_per_second=2.41118G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxMDADouble/1000/0/0          392781 ns       392770 ns         1775 Per Result=392.77ps items_per_second=2.54602G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxMDADouble/10000/0/0       56692628 ns     56692508 ns           11 Per Result=566.925ps items_per_second=1.7639G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxFloat/10/0/0                   51.2 ns         51.2 ns     12757775 Per Result=512.174ps items_per_second=1.95246G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxFloat/100/0/0                  1718 ns         1718 ns       399947 Per Result=171.814ps items_per_second=5.82023G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxFloat/1000/0/0               150638 ns       150636 ns         4535 Per Result=150.636ps items_per_second=6.63852G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayNoBoxFloat/10000/0/0            27513561 ns     27512953 ns           24 Per Result=275.13ps items_per_second=3.63465G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxDouble/10/0/0                 55.8 ns         55.8 ns     12282363 Per Result=557.582ps items_per_second=1.79346G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxDouble/100/0/0                3818 ns         3817 ns       183636 Per Result=381.7ps items_per_second=2.61986G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxDouble/1000/0/0             375191 ns       375181 ns         1864 Per Result=375.181ps items_per_second=2.66538G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayNoBoxDouble/10000/0/0          56539228 ns     56538988 ns           11 Per Result=565.39ps items_per_second=1.76869G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoMDAFloat/10/0/0                 479 ns          479 ns      1453823 Per Result=4.79087ns items_per_second=208.73M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoMDAFloat/100/0/0              50886 ns        50886 ns        13662 Per Result=5.08859ns items_per_second=196.518M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoMDAFloat/1000/0/0           5127208 ns      5126831 ns          135 Per Result=5.12683ns items_per_second=195.052M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoMDAFloat/10000/0/0        580644527 ns    580624346 ns            1 Per Result=5.80624ns items_per_second=172.228M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoMDADouble/10/0/0               445 ns          445 ns      1532980 Per Result=4.45097ns items_per_second=224.67M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoMDADouble/100/0/0            81299 ns        81285 ns         8498 Per Result=8.12846ns items_per_second=123.025M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoMDADouble/1000/0/0         8768173 ns      8767355 ns           79 Per Result=8.76736ns items_per_second=114.059M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoMDADouble/10000/0/0      987950174 ns    987927426 ns            1 Per Result=9.87927ns items_per_second=101.222M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoFloat/10/0/0                   75.4 ns         75.4 ns      9320678 Per Result=753.561ps items_per_second=1.32703G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoFloat/100/0/0                  3315 ns         3315 ns       209879 Per Result=331.512ps items_per_second=3.01648G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoFloat/1000/0/0               303727 ns       303727 ns         2301 Per Result=303.727ps items_per_second=3.29243G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayOrthoFloat/10000/0/0            36511337 ns     36510603 ns           18 Per Result=365.106ps items_per_second=2.73893G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoDouble/10/0/0                 88.0 ns         88.0 ns      7912408 Per Result=879.864ps items_per_second=1.13654G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoDouble/100/0/0                5706 ns         5706 ns       121830 Per Result=570.587ps items_per_second=1.75258G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoDouble/1000/0/0             557123 ns       557096 ns         1236 Per Result=557.096ps items_per_second=1.79502G/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayOrthoDouble/10000/0/0          73417730 ns     73416899 ns            9 Per Result=734.169ps items_per_second=1.36208G/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicMDAFloat/10/0/0            1336 ns         1336 ns       516649 Per Result=13.3557ns items_per_second=74.8744M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicMDAFloat/100/0/0         224119 ns       224102 ns         3206 Per Result=22.4102ns items_per_second=44.6225M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicMDAFloat/1000/0/0      22163222 ns     22160471 ns           31 Per Result=22.1605ns items_per_second=45.1254M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicMDAFloat/10000/0/0   2311667015 ns   2311627284 ns            1 Per Result=23.1163ns items_per_second=43.2596M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicMDADouble/10/0/0          1366 ns         1366 ns       512411 Per Result=13.6585ns items_per_second=73.2145M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicMDADouble/100/0/0       221634 ns       221609 ns         3172 Per Result=22.1609ns items_per_second=45.1246M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicMDADouble/1000/0/0    22374847 ns     22373521 ns           31 Per Result=22.3735ns items_per_second=44.6957M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicMDADouble/10000/0/0 2387770231 ns   2387733737 ns            1 Per Result=23.8773ns items_per_second=41.8807M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicFloat/10/0/0                783 ns          782 ns       902283 Per Result=7.82397ns items_per_second=127.812M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicFloat/100/0/0             42317 ns        42317 ns        16522 Per Result=4.23172ns items_per_second=236.311M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicFloat/1000/0/0          3880681 ns      3880674 ns          180 Per Result=3.88067ns items_per_second=257.687M/s
SelfDistanceArrayCoordinatesBench<float>/SelfDistanceArrayTriclinicFloat/10000/0/0       410044276 ns    410038577 ns            2 Per Result=4.10039ns items_per_second=243.879M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicDouble/10/0/0             1088 ns         1088 ns       643043 Per Result=10.8795ns items_per_second=91.9163M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicDouble/100/0/0           80349 ns        80349 ns         8741 Per Result=8.03492ns items_per_second=124.457M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicDouble/1000/0/0        7726331 ns      7726260 ns           89 Per Result=7.72626ns items_per_second=129.429M/s
SelfDistanceArrayCoordinatesBench<double>/SelfDistanceArrayTriclinicDouble/10000/0/0     876103903 ns    876089564 ns            1 Per Result=8.7609ns items_per_second=114.144M/s

For the regular distance array benchmarks, I picked a range to limit the total number of combinations. We can change this if needed. Thanks