LibWeb/IDB: Implement retrieve_a_value_from_an_object_store

Author: https://github.com/stelar7
Commit: 18a008d073
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4505
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.cpp

@@ -77,4 +77,11 @@ u64 ObjectStore::count_records_in_range(GC::Ref<IDBKeyRange> range)
     return count;
 }
 
+Optional<Record&> ObjectStore::first_in_range(GC::Ref<IDBKeyRange> range)
+{
+    return m_records.first_matching([&](auto const& record) {
+        return range->is_in_range(record.key);
+    });
+}
+
 }