add type safe filters in queryUsers and queryMembers

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

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -1243,11 +1243,10 @@ class MessageInputState extends State<MessageInput> {
     Future<List<Member>> queryMembers;
 
     if (query.isNotEmpty) {
-      queryMembers = StreamChannel.of(context).channel.queryMembers(filter: {
-        'name': {
-          '\$autocomplete': query,
-        },
-      }).then((res) => res.members);
+      queryMembers = StreamChannel.of(context)
+          .channel
+          .queryMembers(filter: Filter.autoComplete('name', query))
+          .then((res) => res.members);
     }
 
     final members = StreamChannel.of(context).channel.state.members?.where((m) {

packages/stream_chat_flutter/lib/src/user_list_view.dart

@@ -72,7 +72,7 @@ class UserListView 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.
   ///