nirfsg: Enable gRPC support without tests

[rahur-NI]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicable.
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

• Enabled gRPC support for nirfsg by including nirfsg.proto file. This file is picked from grpc-device repository.
• Updated functions.py metadata to add grpc_enum mappings for set attribute APIs.
• Updated gRPC stub interpreter template for nirfsg for get_deembedding_sparameters to resolve flake issue.

List issues fixed by this Pull Request below, if any.

What testing has been done?

• codegen changes in generated and doc folder are as needed.
• System tests for grpc are intentionally not included as part of this change as complex datatype support (required for certain test scenarios) will be addressed in a follow-up PR.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 7.16846% with 259 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.77%. Comparing base (c328bc3) to head (0d0e209).

Files with missing lines	Patch %	Lines
generated/nirfsg/nirfsg/_grpc_stub_interpreter.py	0.00%	253 Missing ⚠️
generated/nirfsg/nirfsg/grpc_session_options.py	75.00%	4 Missing ⚠️
generated/nirfsg/nirfsg/session.py	77.77%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (7.16%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2171      +/-   ##
==========================================
- Coverage   89.98%   88.77%   -1.22%     
==========================================
  Files          71       73       +2     
  Lines       18711    18986     +275     
==========================================
+ Hits        16837    16854      +17     
- Misses       1874     2132     +258     

Flag	Coverage Δ
codegenunittests	84.90% <ø> (ø)
nidcpowersystemtests	94.65% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.26% <ø> (ø)
nidigitalunittests	68.44% <ø> (ø)
nidmmsystemtests	92.72% <ø> (ø)
nifakeunittests	85.68% <ø> (ø)
nifgensystemtests	94.61% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsgsystemtests	73.02% <7.16%> (-8.29%)	⬇️
niscopesystemtests	92.94% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	82.03% <ø> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
generated/nirfsg/nirfsg/_library_interpreter.py	74.14% <100.00%> (+0.03%)	⬆️
generated/nirfsg/nirfsg/session.py	89.88% <77.77%> (-0.18%)	⬇️
generated/nirfsg/nirfsg/grpc_session_options.py	75.00% <75.00%> (ø)
generated/nirfsg/nirfsg/_grpc_stub_interpreter.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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