First sketch of a very simple API to create simple graphs

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Codecov Report

Attention: 175 lines in your changes are missing coverage. Please review.

Comparison is base (e90ce31) 83.06% compared to head (3b548ca) 81.72%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   83.06%   81.72%   -1.35%     
==========================================
  Files          38       44       +6     
  Lines        5421     5974     +553     
==========================================
+ Hits         4503     4882     +379     
- Misses        918     1092     +174     

Files	Coverage Δ
onnx_array_api/array_api/__init__.py	93.67% <100.00%> (+0.08%)	⬆️
onnx_array_api/light_api/__init__.py	100.00% <100.00%> (ø)
onnx_array_api/npx/npx_function_implementation.py	78.94% <ø> (ø)
onnx_array_api/npx/npx_helper.py	44.24% <ø> (ø)
onnx_array_api/ext_test_case.py	68.88% <66.66%> (-0.06%)	⬇️
onnx_array_api/light_api/annotations.py	86.36% <86.36%> (ø)
onnx_array_api/array_api/_onnx_common.py	74.32% <42.85%> (-2.07%)	⬇️
onnx_array_api/light_api/var.py	91.96% <91.96%> (ø)
onnx_array_api/light_api/model.py	83.95% <83.95%> (ø)
onnx_array_api/light_api/_op_var.py	50.58% <50.58%> (ø)
... and 1 more

... and 1 file with indirect coverage changes

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