LibWeb: Implement Path2D class

Author: https://github.com/AtkinsSJ
Commit: 2ec52bbbd5
Pull-request: https://github.com/SerenityOS/serenity/pull/14839

Userland/Libraries/LibWeb/Forward.h

@@ -295,6 +295,7 @@ class MessagePort;
 struct NavigationParams;
 class Origin;
 class PageTransitionEvent;
+class Path2D;
 struct PolicyContainer;
 class PromiseRejectionEvent;
 class WorkerDebugConsoleClient;
@@ -582,6 +583,7 @@ class NodeListWrapper;
 class NodeWrapper;
 class OptionConstructor;
 class PageTransitionEventWrapper;
+class Path2DWrapper;
 class PerformanceTimingWrapper;
 class PerformanceWrapper;
 class ProcessingInstructionWrapper;