refactor(srp): move render scene setup into managed urp

managed/XCEngine.ScriptCore/Rendering/Core/ScriptableRenderPipelineAsset.cs

@@ -58,6 +58,18 @@ namespace XCEngine.Rendering
             return GetPipelineRendererAssetKey();
         }
 
+        protected virtual string GetRenderSceneSetupPolicyAssetKey()
+        {
+            return string.Empty;
+        }
+
+        protected virtual string
+            GetRenderSceneSetupPolicyAssetKeyContextual(
+                int rendererIndex)
+        {
+            return GetRenderSceneSetupPolicyAssetKey();
+        }
+
         protected virtual string GetCameraFrameStandalonePassAssetKey(
             CameraFrameStage stage)
         {