Extends export onnx to code to support inner API

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[codecov-commenter]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (75d62a0) 81.32% compared to head (045f9cc) 81.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   81.32%   81.78%   +0.46%     
==========================================
  Files          46       48       +2     
  Lines        6228     6403     +175     
==========================================
+ Hits         5065     5237     +172     
- Misses       1163     1166       +3     

Files	Coverage Δ
onnx_array_api/light_api/__init__.py	93.75% <88.88%> (+1.44%)	⬆️
onnx_array_api/plotting/_helper.py	69.00% <50.00%> (-0.39%)	⬇️
onnx_array_api/light_api/inner_emitter.py	96.05% <96.05%> (ø)
onnx_array_api/light_api/translate.py	76.84% <78.26%> (+8.21%)	⬆️
onnx_array_api/light_api/emitter.py	84.86% <84.86%> (ø)

... and 1 file with indirect coverage changes

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