Vaidate pic_size_in_map_units_minus1, avoid unbounded allocation

[dholroyd]

This requires that read_group_ids() gains access to the SPS, which holds the pic_size_in_map_units we need to compare against.

[github-actions]

Bencher Report

Branch	validate-pic-size-in-map-units
Testbed	Linux

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• L2 Hits (hits)
• Instructions (instructions)
• Total read+write (reads/writes)

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Benchmark	Estimated Cycles	Benchmark Result estimated cycles x 1e6 (Result Δ%)	Upper Boundary estimated cycles x 1e6 (Limit %)	Instructions	instructions x 1e6	L1 Hits	hits x 1e6	L2 Hits	hits x 1e3	RAM Hits	hits x 1e3	Total read+write	reads/writes x 1e6
ci_bench::ci::reader read:setup_video("big_buck_bunny_1080p_24fps_h264.h264"...	📈 view plot 🚷 view threshold	16.67 x 1e6 (-0.03%) Baseline: 16.67 x 1e6	16.74 x 1e6 (99.58%)	📈 view plot ⚠️ NO THRESHOLD	8.20 x 1e6	📈 view plot ⚠️ NO THRESHOLD	10.78 x 1e6	📈 view plot ⚠️ NO THRESHOLD	18.16 x 1e3	📈 view plot ⚠️ NO THRESHOLD	165.62 x 1e3	📈 view plot ⚠️ NO THRESHOLD	10.96 x 1e6

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