Revert "Revert "parse onnx graph for int4""

[pfultz2]

Reverts #3434

[pfultz2]

We can merge this when CI is clear.

[codecov]

Codecov Report

Attention: Patch coverage is 60.86957% with 9 lines in your changes missing coverage. Please review.

Project coverage is 92.11%. Comparing base (7df8038) to head (3a7f1bf).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/onnx/onnx_parser.cpp	60.86%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3435      +/-   ##
===========================================
- Coverage    92.14%   92.11%   -0.04%     
===========================================
  Files          504      504              
  Lines        20508    20526      +18     
===========================================
+ Hits         18898    18907       +9     
- Misses        1610     1619       +9     

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