LibWeb: Implement navigator.clipboard.write

Author: https://github.com/trflynn89
Commit: a4e9a27343
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4548
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/Clipboard/Clipboard.h

@@ -25,6 +25,7 @@ public:
 
     GC::Ref<WebIDL::Promise> read_text();
 
+    GC::Ref<WebIDL::Promise> write(GC::RootVector<GC::Root<ClipboardItem>>&);
     GC::Ref<WebIDL::Promise> write_text(String);
 
 private: