AK: Export Statistics to the global namespace

Author: https://github.com/LucasChollet
Commit: c6e4563489
Pull-request: https://github.com/SerenityOS/serenity/pull/24330
Reviewed-by: https://github.com/nico ✅

AK/Statistics.h

@@ -123,3 +123,7 @@ private:
 };
 
 }
+
+#if USING_AK_GLOBALLY
+using AK::Statistics;
+#endif