Python API for HOST_ACCESSIBLE OrtValue allocation (#28038)
### Description
Adds memory_info= parameter to OrtValue.ortvalue_from_shape_and_type(),
backed by two new C-level factory methods that look up the registered
shared allocator via the full OrtMemoryInfo (including mem_type).
This is required because the current shared allocator query doesn't
include the memory type making HOST_ACCESSIBLE invisible to python.
UsesCpuMemory() is used in GetPyObjFromTensor so that tensors in
HOST_ACCESSIBLE memory are returned as zero-copy numpy views.
### Motivation and Context
Enable zero copy interop between numpy and ortvalue.
This is a follow up for
https://github.com/microsoft/onnxruntime/pull/28037
