LibWeb: Implement '5.5. Response class' from the Fetch API :^)

Author: https://github.com/linusg
Commit: 0b52b883af
Pull-request: https://github.com/SerenityOS/serenity/pull/15359
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/davidot ✅
Reviewed-by: https://github.com/kennethmyhra

Userland/Libraries/LibWeb/idl_files.cmake

@@ -54,6 +54,7 @@ libweb_js_bindings(Encoding/TextDecoder)
 libweb_js_bindings(Encoding/TextEncoder)
 libweb_js_bindings(Fetch/Headers ITERABLE)
 libweb_js_bindings(Fetch/Request)
+libweb_js_bindings(Fetch/Response)
 libweb_js_bindings(FileAPI/Blob)
 libweb_js_bindings(FileAPI/File)
 libweb_js_bindings(Geometry/DOMPoint)