Create ORT fusion rules from opset 23 to custom ops

[justinchuby]

Maybe? Or we can stick with the standard opset. But ONNX Runtime can be slow on the standard opset right now due to kernel availability.

@gramalingam @xadupre @titaiwangms

[titaiwangms]

It looks like it's this folder: https://github.com/microsoft/onnxscript/blob/main/onnxscript/rewriter/onnx_fusions/_onnx_fusions.py

[justinchuby]

This is the ONNX standard op fusions not the custom ops