Register aten::pow.Scalar for aten::pow

[keenranger]

Hello,

After upgrading onnxscript from version 0.1.0.dev20240516 to the latest version, I encountered an error while trying to export my Torch model to ONNX:

torch.onnx._internal.diagnostics.infra.context.RuntimeErrorWithDiagnostic: Unsupported FX nodes: {'call_function': ['aten.pow.Scalar']}. 

Upon investigating the issue, I found that the changes made to aten_pow in PR #1612 are causing this problem. Reverting these changes allows the model to be exported to ONNX successfully again.

Could support for aten::pow be reintroduced to enable smooth exporting of models?

Thank you for your consideration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.31%. Comparing base (08c8307) to head (619711d).

❗ There is a different number of reports uploaded between BASE (08c8307) and HEAD (619711d). Click for more details.

HEAD has 26 uploads less than BASE

Flag	BASE (08c8307)	HEAD (619711d)
	27	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1719       +/-   ##
===========================================
- Coverage   75.23%   40.31%   -34.93%     
===========================================
  Files         242      172       -70     
  Lines       25861    23385     -2476     
  Branches     4660     4205      -455     
===========================================
- Hits        19456     9427    -10029     
- Misses       5519    13557     +8038     
+ Partials      886      401      -485     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[keenranger]

Model still exportable with aten::pow.Scalar. Thank you @justinchuby !!
Formatting was needed, so I added commit about it.

[justinchuby]

Thank you for your contribution!