Implement list of available images matching logic

[pgorszkowski-igalia]

https://bugs.webkit.org/show_bug.cgi?id=243790

Reviewed by Sihui Liu and Chris Dumez.

Implement list of available images matching logic: https://html.spec.whatwg.org/multipage/images.html#updating-the-image-data:list-of-available-images

This is restricted to lazy loading for now.

• LayoutTests/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-available-expected.txt:
• LayoutTests/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-use-list-of-available-images-expected.txt:
• Source/WebCore/loader/ImageLoader.cpp: (WebCore::canReuseFromListOfAvailableImages): (WebCore::ImageLoader::updateFromElement):