refactor(srp): move camera frame plan policy into managed urp

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

@@ -58,6 +58,17 @@ namespace XCEngine.Rendering
             return GetPipelineRendererAssetKey();
         }
 
+        protected virtual string GetCameraFramePlanPolicyAssetKey()
+        {
+            return string.Empty;
+        }
+
+        protected virtual string GetCameraFramePlanPolicyAssetKeyContextual(
+            int rendererIndex)
+        {
+            return GetCameraFramePlanPolicyAssetKey();
+        }
+
         protected virtual string GetRenderSceneSetupPolicyAssetKey()
         {
             return string.Empty;