onnxruntime

Add 2 C API for ort extension (#19808)

### Description
<!-- Describe your changes. -->
Add 2 C API for ORT extension:
- KernelInfo_GetAllocator
- OrtCustomOp::GetMayInplace


### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
Add 2 C API for ORT extension project, which will leverage these 2 APIs
for GroupQueryAttention custom op.