Introduce export feature to TensorRT JSON format

[mirza-halilcevic]

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

[codecov[bot]]

Codecov Report

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

Project coverage is 92.05%. Comparing base (ebf82f6) to head (c9e5f2b). Report is 96 commits behind head on develop.

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

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3721      +/-   ##
===========================================
- Coverage    92.18%   92.05%   -0.13%     
===========================================
  Files          514      522       +8     
  Lines        21780    24411    +2631     
===========================================
+ Hits         20078    22472    +2394     
- Misses        1702     1939     +237     

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