feat: Converted to ios models

packages/stream_chat/lib/src/models/reaction.g.dart

@@ -9,17 +9,13 @@ part of 'reaction.dart';
 Reaction _$ReactionFromJson(Map json) {
   return Reaction(
     messageId: json['message_id'] as String?,
-    createdAt: json['created_at'] == null
-        ? null
-        : DateTime.parse(json['created_at'] as String),
-    type: json['type'] as String?,
-    user: json['user'] == null
-        ? null
-        : User.fromJson((json['user'] as Map?)?.map(
-            (k, e) => MapEntry(k as String, e),
-          )),
+    createdAt: DateTime.parse(json['created_at'] as String),
+    type: json['type'] as String,
+    user: User.fromJson((json['user'] as Map?)?.map(
+      (k, e) => MapEntry(k as String, e),
+    )),
     userId: json['user_id'] as String?,
-    score: json['score'] as int?,
+    score: json['score'] as int,
     extraData: (json['extra_data'] as Map?)?.map(
       (k, e) => MapEntry(k as String, e),
     ),