onnxruntime

744e7fe1 - Add type definitions, registration, utilities for INT2/UINT2 support (#26824)

Add type definitions, registration, utilities for INT2/UINT2 support (#26824) ### Description This is first PR towards adding 2 bit support to ORT I will create follow up PRs to - Add CPU operators (CAST, QDQ, non compute ops) ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> - ONNX recently added 2 bit support https://github.com/onnx/onnx/pull/7446