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/InternalCalls.cs

@@ -839,6 +839,18 @@ namespace XCEngine
             Rendering_CameraRenderRequestContext_GetHasDirectionalShadow(
                 ulong nativeHandle);
 
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        internal static extern void
+            Rendering_CameraRenderRequestContext_GetDirectionalShadowPlanningSettings(
+                ulong nativeHandle,
+                out Rendering.DirectionalShadowPlanningSettings settings);
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        internal static extern void
+            Rendering_CameraRenderRequestContext_SetDirectionalShadowPlanningSettings(
+                ulong nativeHandle,
+                ref Rendering.DirectionalShadowPlanningSettings settings);
+
         [MethodImpl(MethodImplOptions.InternalCall)]
         internal static extern void
             Rendering_CameraRenderRequestContext_ClearDirectionalShadow(