Add onnxscript to peephole pass

[xiaoyu-work]

Describe your changes

• Add onnxscrits to peephole pass
• Remove self-implemented constant folding.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
• Is this PR including examples changes? If yes, please remember to update example documentation in a follow-up PR.

(Optional) Issue link

Could you also remove the unused helper functions in the test _get_onnx_model_with_constant and _run_onnx_model?

[xiaoyu-work]

/azp run

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