onnxruntime

b832ca3d - Support read-only allocator for use with initializers (#25348)

Support read-only allocator for use with initializers (#25348) ### Description <!-- Describe your changes. --> Add new allocator type of OrtReadOnlyAllocator to enable providing a separate allocator that is only used for initializers. Update the SessionState logic to support this allocator type being provided, and use it when doing device allocations for initializers. ### 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. --> Performance.