use common analysis options

packages/stream_chat/lib/src/models/channel_model.dart

@@ -112,7 +112,7 @@ class ChannelModel {
 
   /// Shortcut for channel name
   String get name =>
-      extraData.containsKey('name') ? extraData['name'] as String : cid;
+      extraData.containsKey('name') ? extraData['name']! as String : cid;
 
   /// Serialize to json
   Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(

packages/stream_chat/lib/src/models/user.dart

@@ -83,7 +83,7 @@ class User {
   /// Shortcut for user name
   String get name {
     if (extraData.containsKey('name')) {
-      final name = extraData['name'] as String;
+      final name = extraData['name']! as String;
       if (name.isNotEmpty) return name;
     }
     return id;