Add unittests for YOLOGraphSurgeon

[zhiqwang]

• Rename to test_yolo_trt_module_to_onnx
• Add unittest for test_yolo_graphsurgeon_wo_nms
• Add unittest for test_yolo_graphsurgeon_register_nms

[codecov]

Codecov Report

Merging #275 (7bd40e3) into main (6ea355d) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
+ Coverage   93.82%   94.01%   +0.18%     
==========================================
  Files          11       11              
  Lines         696      718      +22     
==========================================
+ Hits          653      675      +22     
  Misses         43       43              

Flag	Coverage Δ
unittests	94.01% <100.00%> (+0.18%)	⬆️

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Impacted Files	Coverage Δ
test/test_runtime.py	100.00% <100.00%> (ø)

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