Integrate with ONNX 1.18.0 release branch

[ramkrishna2910]

We are releasing ONNX 1.18.0. A release branch is created (https://github.com/onnx/onnx/tree/rel-1.18.0). Release candidates are also available from TestPyPI: pip install -i https://test.pypi.org/simple/ --pre onnx

Updates to op-list and other key updates can be found here: https://github.com/onnx/onnx/wiki/Logistics-for-ONNX-Release-1.18.0

It is important to integrate ONNX release branch ASAP so that any issues and incompatibilities can be detected and resolved before the ONNX release.

In case a bug in ONNX is detected during integration of ONNX 1.18.0, please open a ONNX Bug Report and tag ONNX Release Manager @ramkrishna2910 so that the bug is fixed in the ONNX release branch.