Add onnx mean

[cBournhonesque]

Pull Request Template

Checklist

• Confirmed that run-checks all script has been executed.

Related Issues/PRs

#1714

Changes

Add mean ops

Testing

Added test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.23%. Comparing base (cd848b1) to head (ddd8051).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2119      +/-   ##
==========================================
+ Coverage   86.21%   86.23%   +0.01%     
==========================================
  Files         690      691       +1     
  Lines       88620    88720     +100     
==========================================
+ Hits        76406    76506     +100     
  Misses      12214    12214              

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[laggui]

Thanks for contributing this operator! 🙏

Implementation looks good, just some very minor changes related to formatting before we can merge.

[cBournhonesque]

Thanks for contributing this operator! 🙏

Implementation looks good, just some very minor changes related to formatting before we can merge.

SG! Applied the fixes

[cBournhonesque]

@antimora you might want to update the original issue