Add OpAttr_GetName C API for EP ABI (#25224)

### Description
This PR add additional  OpAttr_GetName C API for EP ABI use.

Author: mingyueliuh

include/onnxruntime/core/session/onnxruntime_c_api.h

@@ -5917,6 +5917,17 @@ struct OrtApi {
    */
   ORT_API2_STATUS(OpAttr_GetType, _In_ const OrtOpAttr* attribute, _Out_ OrtOpAttrType* type);
 
+  /** \brief Get the attribute name from an OrtOpAttr.
+   *
+   * \param[in] attribute The OrtOpAttr instance.
+   * \param[out] name Output parameter set to the attribute's name. The name is a null-terminated string.
+   *
+   * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.23.
+   */
+  ORT_API2_STATUS(OpAttr_GetName, _In_ const OrtOpAttr* attribute, _Outptr_ const char** name);
+
   /** \brief Get the subgraphs, as OrtGraph instances, contained by the given node.
    *
    * Certain operator types (e.g., If and Loop) contain nested subgraphs.

onnxruntime/core/session/onnxruntime_c_api.cc

@@ -2935,6 +2935,20 @@ ORT_API_STATUS_IMPL(OrtApis::OpAttr_GetType, _In_ const OrtOpAttr* attribute, _O
   API_IMPL_END
 }
 
+ORT_API_STATUS_IMPL(OrtApis::OpAttr_GetName, _In_ const OrtOpAttr* attribute, _Outptr_ const char** name) {
+  API_IMPL_BEGIN
+  if (name == nullptr) {
+    return OrtApis::CreateStatus(ORT_INVALID_ARGUMENT, "name argument is null");
+  }
+  if (attribute == nullptr) {
+    return OrtApis::CreateStatus(ORT_INVALID_ARGUMENT, "attribute argument is null");
+  }
+
+  *name = attribute->attr_proto.name().c_str();
+  return nullptr;
+  API_IMPL_END
+}
+
 ORT_API_STATUS_IMPL(OrtApis::Node_GetSubgraphs, _In_ const OrtNode* node, _Outptr_ OrtArrayOfConstObjects** subgraphs) {
   API_IMPL_BEGIN
   if (subgraphs == nullptr) {
@@ -3638,6 +3652,7 @@ static constexpr OrtApi ort_api_1_to_23 = {
     &OrtApis::Node_GetAttributes,
     &OrtApis::Node_GetAttributeByName,
     &OrtApis::OpAttr_GetType,
+    &OrtApis::OpAttr_GetName,
     &OrtApis::Node_GetSubgraphs,
     &OrtApis::Node_GetParentGraph,
 

onnxruntime/core/session/ort_apis.h

@@ -665,6 +665,7 @@ ORT_API_STATUS_IMPL(Node_GetImplicitInputs, _In_ const OrtNode* node, _Outptr_ O
 ORT_API_STATUS_IMPL(Node_GetAttributes, _In_ const OrtNode* node, _Outptr_ OrtArrayOfConstObjects** attrs);
 ORT_API_STATUS_IMPL(Node_GetAttributeByName, _In_ const OrtNode* node, _In_ const char* attribute_name, _Outptr_ const OrtOpAttr** attribute);
 ORT_API_STATUS_IMPL(OpAttr_GetType, _In_ const OrtOpAttr* attribute, _Out_ OrtOpAttrType* type);
+ORT_API_STATUS_IMPL(OpAttr_GetName, _In_ const OrtOpAttr* attribute, _Outptr_ const char** name);
 ORT_API_STATUS_IMPL(Node_GetSubgraphs, _In_ const OrtNode* node, _Outptr_ OrtArrayOfConstObjects** subgraphs);
 ORT_API_STATUS_IMPL(Node_GetParentGraph, _In_ const OrtNode* node,
                     _Outptr_result_maybenull_ const OrtGraph** parent_graph);

onnxruntime/test/ep_graph/test_ep_graph.cc

@@ -473,6 +473,10 @@ static void CheckGraphCApi(const GraphViewer& graph_viewer, const OrtGraph& api_
         ASSERT_ORTSTATUS_OK(ort_api.Node_GetAttributeByName(api_node, node_attr.first.c_str(), &api_node_attr));
         ASSERT_NE(api_node_attr, nullptr);
 
+        const char* api_node_attr_name = nullptr;
+        ASSERT_ORTSTATUS_OK(ort_api.OpAttr_GetName(api_node_attr, &api_node_attr_name));
+        ASSERT_STREQ(api_node_attr_name, node_attr.first.c_str());
+
         OrtOpAttrType api_node_attr_type = OrtOpAttrType::ORT_OP_ATTR_UNDEFINED;
 
         // It's possible that the type is defined in ONNX::AttributeProto_AttributeType but not in OrtOpAttrType, since the two are not in a 1:1 mapping.