feat(persistence): add pinned message reactions table

packages/stream_chat_persistence/lib/src/entity/entity.dart

@@ -3,6 +3,7 @@ export 'channels.dart';
 export 'connection_events.dart';
 export 'members.dart';
 export 'messages.dart';
+export 'pinned_message_reactions.dart';
 export 'pinned_messages.dart';
 export 'reactions.dart';
 export 'reads.dart';

packages/stream_chat_persistence/lib/src/entity/pinned_message_reactions.dart

@@ -0,0 +1,13 @@
+// coverage:ignore-file
+import 'package:moor/moor.dart';
+
+import 'package:stream_chat_persistence/src/entity/reactions.dart';
+
+/// Represents a [PinnedMessageReactions] table in [MoorChatDatabase].
+@DataClassName('PinnedMessageReactionEntity')
+class PinnedMessageReactions extends Reactions {
+  /// The messageId to which the reaction belongs
+  @override
+  TextColumn get messageId => text()
+      .customConstraint('REFERENCES pinned_messages(id) ON DELETE CASCADE')();
+}