Rename helpers into helper

[xadupre]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.17085% with 325 lines in your changes missing coverage. Please review.

Project coverage is 68.83%. Comparing base (c0df801) to head (ae1c491).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
onnx_diagnostic/torch_onnx/sbs.py	6.35%	162 Missing ⚠️
onnx_diagnostic/helpers/onnx_helper.py	72.45%	149 Missing ⚠️
onnx_diagnostic/ext_test_case.py	72.50%	11 Missing ⚠️
onnx_diagnostic/helpers/helper.py	66.66%	2 Missing ⚠️
...torch_export_patches/patches/patch_transformers.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   71.16%   68.83%   -2.33%     
==========================================
  Files          55       57       +2     
  Lines        4227     4438     +211     
==========================================
+ Hits         3008     3055      +47     
- Misses       1219     1383     +164     

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