[DML EP] Expose NPU macro via build command (microsoft#20306)

### Description
This fixes following things:
- Expose `ENABLE_NPU_ADAPTER_ENUMERATION` macro via build command, so
that a user can enable NPU support for DML EP seamlessly.
- Add keyword `_dmlEp_` as part of the node name, which would be useful
for debugging purpose.



### 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. -->

cmake/CMakeLists.txt

@@ -848,6 +848,9 @@ if (onnxruntime_USE_DML)
     list(APPEND ORT_PROVIDER_FLAGS  -DUSE_DML=1)
     list(APPEND ORT_PROVIDER_CMAKE_FLAGS -Donnxruntime_USE_DML=1)
     list(APPEND ONNXRUNTIME_PROVIDER_NAMES dml)
+    if(onnxruntime_ENABLE_NPU_ADAPTER_ENUMERATION)
+      list(APPEND ORT_PROVIDER_FLAGS -DENABLE_NPU_ADAPTER_ENUMERATION=1)
+    endif()
 endif()
 if (onnxruntime_USE_MIGRAPHX)
     list(APPEND ORT_PROVIDER_FLAGS  -DUSE_MIGRAPHX=1)

onnxruntime/core/providers/dml/DmlExecutionProvider/src/GraphDescBuilder.cpp

@@ -194,7 +194,7 @@ namespace Dml::GraphDescBuilder
 
     uint32_t SetAndGetDmlGraphNodeIndex(
         const uint32_t operatorDmlGraphNodeIndex,
-        const std::string& nodeNamePrefix,
+        const onnxruntime::Node& node,
         AbstractOperatorDesc& operatorDesc,
         /*in_out*/std::unordered_map<uint32_t, uint32_t>& operatorDmlGraphToDmlGraphNodeIndexMap,
         /*in_out*/std::vector<DmlSerializedGraphNode>& dmlGraphNodes)
@@ -205,7 +205,7 @@ namespace Dml::GraphDescBuilder
             return iter->second;
         }
         operatorDmlGraphToDmlGraphNodeIndexMap[operatorDmlGraphNodeIndex] = static_cast<uint32_t>(dmlGraphNodes.size());
-        dmlGraphNodes.push_back({operatorDesc, nodeNamePrefix + std::to_string(operatorDmlGraphNodeIndex)});
+        dmlGraphNodes.push_back({operatorDesc, GetUniqueNodeName(node) + "_dmlEp_" + std::to_string(operatorDmlGraphNodeIndex)});
         return operatorDmlGraphToDmlGraphNodeIndexMap[operatorDmlGraphNodeIndex];
     }
 
@@ -432,7 +432,7 @@ namespace Dml::GraphDescBuilder
                 {
                     uint32_t dmlGraphNodeIndex = SetAndGetDmlGraphNodeIndex(
                         operatorDmlGraphInputEdge.ToNodeIndex,
-                        node.Name(),
+                        node,
                         *operatorDmlGraphCreateInfo.nodes[operatorDmlGraphInputEdge.ToNodeIndex],
                         operatorDmlGraphToDmlGraphNodeIndexMap,
                         dmlGraphNodes);
@@ -508,13 +508,13 @@ namespace Dml::GraphDescBuilder
                 DmlIntermediateSerializedGraphEdge edge = {};
                 uint32_t shiftedFromNodeIndex = SetAndGetDmlGraphNodeIndex(
                         operatorGraphIntermediateEdge.FromNodeIndex,
-                        node.Name(),
+                        node,
                         *operatorDmlGraphCreateInfo.nodes[operatorGraphIntermediateEdge.FromNodeIndex],
                         operatorDmlGraphToDmlGraphNodeIndexMap,
                         dmlGraphNodes);
                 uint32_t shiftedToNodeIndex = SetAndGetDmlGraphNodeIndex(
                         operatorGraphIntermediateEdge.ToNodeIndex,
-                        node.Name(),
+                        node,
                         *operatorDmlGraphCreateInfo.nodes[operatorGraphIntermediateEdge.ToNodeIndex],
                         operatorDmlGraphToDmlGraphNodeIndexMap,
                         dmlGraphNodes);
@@ -535,7 +535,7 @@ namespace Dml::GraphDescBuilder
                 {
                     uint32_t shiftedNodeIndex = SetAndGetDmlGraphNodeIndex(
                             operatorGraphOutputEdge.FromNodeIndex,
-                            node.Name(),
+                            node,
                             *operatorDmlGraphCreateInfo.nodes[operatorGraphOutputEdge.FromNodeIndex],
                             operatorDmlGraphToDmlGraphNodeIndexMap,
                             dmlGraphNodes);