Introduce export feature to TensorRT JSON format

[mirza-halilcevic]

• Implement an option to export MIGraphX models into a TensorRT-compatible JSON format

[codecov]

Codecov Report

Attention: Patch coverage is 2.17391% with 90 lines in your changes missing coverage. Please review.

Project coverage is 91.80%. Comparing base (ebf82f6) to head (c9e5f2b).

Files with missing lines	Patch %	Lines
src/trt_json.cpp	0.00%	89 Missing ⚠️
src/load_save.cpp	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3721      +/-   ##
===========================================
- Coverage    92.18%   91.80%   -0.38%     
===========================================
  Files          514      515       +1     
  Lines        21780    21872      +92     
===========================================
+ Hits         20078    20080       +2     
- Misses        1702     1792      +90     

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