Refactor VisibilityNotifier3D

* This is the 3D counterpart to #49632
* Implemented a bit different as 3D works using instancing

After merged, both 2D and 3D classes will most likely be renamed in a separate PR to DisplayNotifier2D/3D.

servers/rendering/renderer_scene.h

@@ -207,6 +207,7 @@ public:
 
 	virtual void update() = 0;
 	virtual void render_probes() = 0;
+	virtual void update_visibility_notifiers() = 0;
 
 	virtual bool free(RID p_rid) = 0;