LibWeb/IDB: Implement evaluate_key_path_on_a_value

Author: https://github.com/stelar7
Commit: 84ea78eb4d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4317
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kennethmyhra ✅

Libraries/LibWeb/IndexedDB/Internal/Algorithms.h

@@ -30,5 +30,6 @@ GC::Ref<HTML::DOMStringList> create_a_sorted_name_list(JS::Realm&, Vector<String
 void commit_a_transaction(JS::Realm&, GC::Ref<IDBTransaction>);
 WebIDL::ExceptionOr<JS::Value> clone_in_realm(JS::Realm&, JS::Value, GC::Ref<IDBTransaction>);
 WebIDL::ExceptionOr<ErrorOr<GC::Ref<Key>>> convert_a_value_to_a_multi_entry_key(JS::Realm&, JS::Value);
+WebIDL::ExceptionOr<ErrorOr<JS::Value>> evaluate_key_path_on_a_value(JS::Realm&, JS::Value, KeyPath const&);
 
 }