LibWeb: Add a test for mouse{over,out,enter,leave} events

Author: https://github.com/kalenikaliaksandr
Commit: 0652d159cf
Pull-request: https://github.com/SerenityOS/serenity/pull/23706

Userland/Libraries/LibWeb/Internals/Internals.h

@@ -26,6 +26,7 @@ public:
     void commit_text();
 
     void click(double x, double y);
+    void move_pointer_to(double x, double y);
     void wheel(double x, double y, double delta_x, double delta_y);
 
     WebIDL::ExceptionOr<bool> dispatch_user_activated_event(DOM::EventTarget&, DOM::Event& event);