Ladybird: Port over ConsoleWidget from the SerenityOS Browser

While this adds a fair bit of widget code, we're also increasing code
sharing by using the same bits in WebContentClient for interacting with
the JS console.

That said, we should look for more ways to share code here.

Ladybird/CMakeLists.txt

@@ -50,14 +50,15 @@ find_package(Qt6 REQUIRED COMPONENTS Core Widgets Network)
 
 set(SOURCES
     BrowserWindow.cpp
+    ConsoleWidget.cpp
     CookieJar.cpp
-    WebContentView.cpp
     History.cpp
     ModelTranslator.cpp
     Settings.cpp
     SettingsDialog.cpp
     Tab.cpp
     Utilities.cpp
+    WebContentView.cpp
     main.cpp
 )