LibWeb/IDB: Implement IDBObjectStore::add_or_put

Author: https://github.com/stelar7
Commit: a06cec7a3c
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4317
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kennethmyhra ✅

Libraries/LibWeb/IndexedDB/IDBObjectStore.h

@@ -44,6 +44,8 @@ public:
     WebIDL::ExceptionOr<GC::Ref<IDBIndex>> index(String const&);
     WebIDL::ExceptionOr<void> delete_index(String const&);
 
+    [[nodiscard]] WebIDL::ExceptionOr<GC::Ref<IDBRequest>> add_or_put(GC::Ref<IDBObjectStore>, JS::Value, Optional<JS::Value> const&, bool);
+
 protected:
     explicit IDBObjectStore(JS::Realm&, GC::Ref<ObjectStore>, GC::Ref<IDBTransaction>);
     virtual void initialize(JS::Realm&) override;