LibWeb/IDB: Implement retrieve_multiple_values_from_an_object_store

Author: https://github.com/stelar7
Commit: ddaae635ac
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4662
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.h

@@ -56,6 +56,7 @@ public:
     u64 count_records_in_range(GC::Ref<IDBKeyRange> range);
     Optional<Record&> first_in_range(GC::Ref<IDBKeyRange> range);
     void clear_records();
+    GC::ConservativeVector<Record> first_n_in_range(GC::Ref<IDBKeyRange> range, Optional<WebIDL::UnsignedLong> count);
 
 protected:
     virtual void visit_edges(Visitor&) override;