Implements onnx2string and string2onnx

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Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (8956308) 78.32% compared to head (28354f8) 78.33%.

❗ Current head 28354f8 differs from pull request most recent head 64d0003. Consider uploading reports for the commit 64d0003 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   78.32%   78.33%           
=======================================
  Files          35       35           
  Lines        3604     3674   +70     
=======================================
+ Hits         2823     2878   +55     
- Misses        781      796   +15     

Files	Coverage Δ
onnx_extended/tools/onnx_io.py	91.07% <100.00%> (+5.77%)	⬆️
onnx_extended/tools/onnx_nodes.py	72.37% <68.75%> (-0.34%)	⬇️

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