Update OrtEpFactory in new EPs

[skottmckay]

Description

Update OrtEpFactory in new EPs to add allocator, data transfer and stream stubs.

Motivation and Context

[Copilot]

Pull Request Overview

This PR updates the OrtEpFactory implementations in new execution providers (VitisAI, OpenVINO, and NvTensorRtRtx) to add stub implementations for allocator, data transfer, and stream-related functionality.

• Adds stub implementations for CreateAllocator/ReleaseAllocator functions that return appropriate error statuses
• Implements CreateDataTransfer stubs that return nullptr to indicate no support
• Adds IsStreamAware and CreateSyncStreamForDevice implementations that indicate no stream support

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
vitisai_provider_factory.cc	Adds allocator, data transfer, and stream stub implementations to VitisAIEpFactory
ov_factory.h	Adds stub method implementations and reorganizes GetVersionImpl for OpenVINOEpPluginFactory
ov_factory.cc	Updates constructor to assign the new stub function pointers
nv_provider_factory.cc	Adds allocator, data transfer, and stream stub implementations to NvTensorRtRtxEpFactory

Comments suppressed due to low confidence (1)

onnxruntime/core/providers/openvino/ov_factory.h:160

• Parameter name 'this' is inconsistent with other functions that use 'this_ptr'. Should be renamed to 'this_ptr' for consistency.

  static void ORT_API_CALL ReleaseAllocatorImpl(OrtEpFactory* this, OrtAllocator* allocator) noexcept {

[jywu-msft]

build errors

/onnxruntime_src/onnxruntime/core/providers/openvino/ov_factory.h: In static member function ‘static bool onnxruntime::openvino_ep::OpenVINOEpPluginFactory::IsStreamAwareImpl(const OrtEpFactory*)’:
/onnxruntime_src/onnxruntime/core/providers/openvino/ov_factory.h:170:66: error: unused parameter ‘this_ptr’ [-Werror=unused-parameter]
170 | static bool ORT_API_CALL IsStreamAwareImpl(const OrtEpFactory* this_ptr) noexcept {
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~
/onnxruntime_src/onnxruntime/core/providers/openvino/ov_factory.h: In static member function ‘static OrtStatus* onnxruntime::openvino_ep::OpenVINOEpPluginFactory::CreateSyncStreamForDeviceImpl(OrtEpFactory*, const OrtMemoryDevice*, const OrtKeyValuePairs*, OrtSyncStreamImpl**)’:
/onnxruntime_src/onnxruntime/core/providers/openvino/ov_factory.h:175:87: error: unused parameter ‘memory_device’ [-Werror=unused-parameter]
175 | const OrtMemoryDevice* memory_device,
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/onnxruntime_src/onnxruntime/core/providers/openvino/ov_factory.h:176:88: error: unused parameter ‘stream_options’ [-Werror=unused-parameter]
176 | const OrtKeyValuePairs* stream_options,
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~

[snnn]

Hi there! We haven't cut the release branch for this version yet, so I'm removing the release:1.23.0 label for now to keep things tidy. Thanks so much for your contribution! We'll make sure this gets included when the release is prepared. 🤖