LibWeb+LibJS: Make the EventTarget hierarchy (incl. DOM) GC-allocated

This is a monster patch that turns all EventTargets into GC-allocated
PlatformObjects. Their C++ wrapper classes are removed, and the LibJS
garbage collector is now responsible for their lifetimes.

There's a fair amount of hacks and band-aids in this patch, and we'll
have a lot of cleanup to do after this.

Userland/Libraries/LibWeb/Forward.h

@@ -71,6 +71,7 @@ class LengthPercentage;
 class LengthStyleValue;
 class LinearGradientStyleValue;
 class ListStyleStyleValue;
+class MediaFeatureValue;
 class MediaList;
 class MediaQuery;
 class MediaQueryList;
@@ -447,18 +448,10 @@ class URLSearchParamsIterator;
 
 namespace Web::Bindings {
 class AbortControllerWrapper;
-class AbortSignalWrapper;
-class AttributeWrapper;
 class BlobWrapper;
 class CanvasGradientWrapper;
 class CanvasRenderingContext2DWrapper;
-class CDATASectionWrapper;
-class CharacterDataWrapper;
-class CommentWrapper;
 class CryptoWrapper;
-class DocumentFragmentWrapper;
-class DocumentTypeWrapper;
-class DocumentWrapper;
 class DOMExceptionWrapper;
 class DOMParserWrapper;
 class DOMPointWrapper;
@@ -466,102 +459,23 @@ class DOMPointReadOnlyWrapper;
 class DOMRectListWrapper;
 class DOMRectReadOnlyWrapper;
 class DOMRectWrapper;
-class ElementWrapper;
-class EventTargetWrapper;
 class FileWrapper;
 class HeadersWrapper;
 class HeadersIteratorWrapper;
 class HistoryWrapper;
-class HTMLAnchorElementWrapper;
-class HTMLAreaElementWrapper;
-class HTMLAudioElementWrapper;
-class HTMLBaseElementWrapper;
-class HTMLBodyElementWrapper;
-class HTMLBRElementWrapper;
-class HTMLButtonElementWrapper;
-class HTMLCanvasElementWrapper;
 class HTMLCollectionWrapper;
-class HTMLDataElementWrapper;
-class HTMLDataListElementWrapper;
-class HTMLDetailsElementWrapper;
-class HTMLDialogElementWrapper;
-class HTMLDirectoryElementWrapper;
-class HTMLDivElementWrapper;
-class HTMLDListElementWrapper;
-class HTMLElementWrapper;
-class HTMLEmbedElementWrapper;
-class HTMLFieldSetElementWrapper;
-class HTMLFontElementWrapper;
-class HTMLFormElementWrapper;
-class HTMLFrameElementWrapper;
-class HTMLFrameSetElementWrapper;
-class HTMLHeadElementWrapper;
-class HTMLHeadingElementWrapper;
-class HTMLHRElementWrapper;
-class HTMLHtmlElementWrapper;
-class HTMLIFrameElementWrapper;
-class HTMLImageElementWrapper;
-class HTMLInputElementWrapper;
-class HTMLLabelElementWrapper;
-class HTMLLegendElementWrapper;
-class HTMLLIElementWrapper;
-class HTMLLinkElementWrapper;
-class HTMLMapElementWrapper;
-class HTMLMarqueeElementWrapper;
-class HTMLMediaElementWrapper;
-class HTMLMenuElementWrapper;
-class HTMLMetaElementWrapper;
-class HTMLMeterElementWrapper;
-class HTMLModElementWrapper;
-class HTMLObjectElementWrapper;
-class HTMLOListElementWrapper;
-class HTMLOptGroupElementWrapper;
-class HTMLOptionElementWrapper;
 class HTMLOptionsCollectionWrapper;
-class HTMLOutputElementWrapper;
-class HTMLParagraphElementWrapper;
-class HTMLParamElementWrapper;
-class HTMLPictureElementWrapper;
-class HTMLPreElementWrapper;
-class HTMLProgressElementWrapper;
-class HTMLQuoteElementWrapper;
-class HTMLScriptElementWrapper;
-class HTMLSelectElementWrapper;
-class HTMLSlotElementWrapper;
-class HTMLSourceElementWrapper;
-class HTMLSpanElementWrapper;
-class HTMLStyleElementWrapper;
-class HTMLTableCaptionElementWrapper;
-class HTMLTableCellElementWrapper;
-class HTMLTableColElementWrapper;
-class HTMLTableElementWrapper;
-class HTMLTableRowElementWrapper;
-class HTMLTableSectionElementWrapper;
-class HTMLTemplateElementWrapper;
-class HTMLTextAreaElementWrapper;
-class HTMLTimeElementWrapper;
-class HTMLTitleElementWrapper;
-class HTMLTrackElementWrapper;
-class HTMLUListElementWrapper;
-class HTMLUnknownElementWrapper;
-class HTMLVideoElementWrapper;
 class IdleDeadlineWrapper;
 class ImageDataWrapper;
 class IntersectionObserverWrapper;
 class LocationObject;
-class MediaQueryListWrapper;
 class MessageChannelWrapper;
-class MessagePortWrapper;
 class MutationObserverWrapper;
 class MutationRecordWrapper;
 class NodeListWrapper;
-class NodeWrapper;
 class OptionConstructor;
 class Path2DWrapper;
 class PerformanceTimingWrapper;
-class PerformanceWrapper;
-class ProcessingInstructionWrapper;
-class RangeConstructor;
 class RangePrototype;
 class ResizeObserverWrapper;
 class ScreenWrapper;
@@ -569,47 +483,20 @@ class SelectionWrapper;
 class StorageWrapper;
 class SubtleCryptoWrapper;
 class SVGAnimatedLengthWrapper;
-class SVGCircleElementWrapper;
-class SVGDefsElementWrapper;
-class SVGClipPathElementWrapper;
-class SVGElementWrapper;
-class SVGEllipseElementWrapper;
-class SVGGeometryElementWrapper;
-class SVGGraphicsElementWrapper;
 class SVGLengthWrapper;
-class SVGLineElementWrapper;
-class SVGPathElementWrapper;
-class SVGPolygonElementWrapper;
-class SVGPolylineElementWrapper;
-class SVGRectElementWrapper;
-class SVGSVGElementWrapper;
-class SVGTextContentElementWrapper;
 class TextDecoderWrapper;
 class TextEncoderWrapper;
 class TextMetricsWrapper;
-class TextWrapper;
-class URLConstructor;
-class URLPrototype;
-class URLSearchParamsConstructor;
-class URLSearchParamsIteratorPrototype;
 class URLSearchParamsIteratorWrapper;
-class URLSearchParamsPrototype;
 class URLSearchParamsWrapper;
 class URLWrapper;
 class WebGLRenderingContextWrapper;
-class WebSocketWrapper;
-class WindowObject;
 class WindowProxy;
-class WorkerWrapper;
-class WorkerGlobalScopeWrapper;
 class WorkerLocationWrapper;
 class WorkerNavigatorWrapper;
 class Wrappable;
 class Wrapper;
-class XMLHttpRequestConstructor;
-class XMLHttpRequestEventTargetWrapper;
 class XMLHttpRequestPrototype;
-class XMLHttpRequestWrapper;
 class XMLSerializerWrapper;
 enum class CanPlayTypeResult;
 enum class CanvasFillRule;