refactor(srp): bridge universal shadow planning settings into managed asset

- expose directional shadow planning settings on camera request context\n- let the managed universal asset override planner defaults\n- recompute native directional shadow requests only when settings change

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

@@ -58,6 +58,26 @@ namespace XCEngine.Rendering
                 .Rendering_CameraRenderRequestContext_GetHasDirectionalShadow(
                     m_nativeHandle);
 
+        public DirectionalShadowPlanningSettings
+            directionalShadowPlanningSettings
+        {
+            get
+            {
+                InternalCalls
+                    .Rendering_CameraRenderRequestContext_GetDirectionalShadowPlanningSettings(
+                        m_nativeHandle,
+                        out DirectionalShadowPlanningSettings settings);
+                return settings;
+            }
+            set
+            {
+                InternalCalls
+                    .Rendering_CameraRenderRequestContext_SetDirectionalShadowPlanningSettings(
+                        m_nativeHandle,
+                        ref value);
+            }
+        }
+
         public void ClearDirectionalShadow()
         {
             InternalCalls