Add op (batch_norm) | feat(torchlib)

[titaiwangms]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.03%. Comparing base (19f1126) to head (86e57ef).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1761      +/-   ##
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+ Coverage   75.01%   75.03%   +0.02%     
==========================================
  Files         245      245              
  Lines       26451    26456       +5     
  Branches     4826     4828       +2     
==========================================
+ Hits        19841    19851      +10     
+ Misses       5677     5673       -4     
+ Partials      933      932       -1     

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[titaiwangms]

torch.export.export does not use aten::batch_norm, but use aten::native_batch_norm_legit (pytorch/pytorch#88697). We can revisit when we actually run into batch_norm missing op.