LibWeb: Implement navigator.clipboard.read

Author: https://github.com/trflynn89
Commit: 912009f6b3
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4548
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/Clipboard/Clipboard.idl

@@ -6,8 +6,12 @@ typedef sequence<ClipboardItem> ClipboardItems;
 // https://w3c.github.io/clipboard-apis/#clipboard
 [SecureContext, Exposed=Window]
 interface Clipboard : EventTarget {
-    [FIXME] Promise<ClipboardItems> read();
+    Promise<ClipboardItems> read(optional ClipboardUnsanitizedFormats formats = {});
     Promise<DOMString> readText();
     Promise<undefined> write(ClipboardItems data);
     Promise<undefined> writeText(DOMString data);
 };
+
+dictionary ClipboardUnsanitizedFormats {
+    sequence<DOMString> unsanitized;
+};