LibWebView+UI: Generate the application debug menu

By migrating the debug menu to LibWebView, the AppKit and Qt UIs are now
in sync - the AppKit UI was previously missing some actions.

Further, this inadvertently fixes bugs around applying debug settings to
new web views, especially across site-isolated processes. We were
previously not applying settings appropriately; this now "just works" in
the LibWebView infra.

Libraries/LibWebView/Menu.h

@@ -52,6 +52,28 @@ enum class ActionID {
     UnmuteMedia,
     ToggleMediaControlsState,
     ToggleMediaLoopState,
+
+    DumpSessionHistoryTree,
+    DumpDOMTree,
+    DumpLayoutTree,
+    DumpPaintTree,
+    DumpStackingContextTree,
+    DumpDisplayList,
+    DumpStyleSheets,
+    DumpStyles,
+    DumpCSSErrors,
+    DumpCookies,
+    DumpLocalStorage,
+    DumpGCGraph,
+    ShowLineBoxBorders,
+    CollectGarbage,
+    ClearCache,
+    ClearCookies,
+    SpoofUserAgent,
+    NavigatorCompatibilityMode,
+    EnableScripting,
+    EnableContentFiltering,
+    BlockPopUps,
 };
 
 class WEBVIEW_API Action