add type safe filters in queryUsers and queryMembers

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_flutter_core/lib/src/user_list_core.dart

@@ -90,7 +90,7 @@ class UserListCore extends StatefulWidget {
   /// The query filters to use.
   /// You can query on any of the custom fields you've defined on the [Channel].
   /// You can also filter other built-in channel fields.
-  final Map<String, dynamic>? filter;
+  final Filter? filter;
 
   /// Query channels options.
   ///

packages/stream_chat_flutter_core/lib/src/users_bloc.dart

@@ -58,7 +58,7 @@ class UsersBlocState extends State<UsersBloc>
   /// online/offline.
   /// [API Reference](https://getstream.io/chat/docs/flutter-dart/query_users/?language=dart)
   Future<void> queryUsers({
-    Map<String, dynamic>? filter,
+    Filter? filter,
     List<SortOption>? sort,
     Map<String, dynamic>? options,
     PaginationParams? pagination,