feat(llc, persistence): add support for open and close persistence via client.

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat/test/src/db/chat_persistence_client_test.dart

@@ -15,6 +15,9 @@ class TestPersistenceClient extends ChatPersistenceClient {
   @override
   bool get isConnected => throw UnimplementedError();
 
+  @override
+  String? get userId => throw UnimplementedError();
+
   @override
   Future<void> connect(String userId) => throw UnimplementedError();
 

packages/stream_chat/test/src/mocks.dart

@@ -64,11 +64,16 @@ class MockAttachmentFileUploader extends Mock
     implements AttachmentFileUploader {}
 
 class MockPersistenceClient extends Mock implements ChatPersistenceClient {
-  @override
-  Future<void> connect(String userId) => Future.value();
+  bool _isConnected = false;
 
   @override
-  Future<void> disconnect({bool flush = false}) => Future.value();
+  bool get isConnected => _isConnected;
+
+  @override
+  Future<void> connect(String userId) async => _isConnected = true;
+
+  @override
+  Future<void> disconnect({bool flush = false}) async => _isConnected = false;
 }
 
 class MockStreamChatClient extends Mock implements StreamChatClient {