copyWith method
- String? id,
- List<ChatMessageModel> ? messages,
- int? unreadMessages,
- DateTime? lastUsed,
- ChatMessageModel? lastMessage,
- bool? canBeDeleted,
override
    Implementation
@override
ChatModel copyWith({
  String? id,
  List<ChatMessageModel>? messages,
  int? unreadMessages,
  DateTime? lastUsed,
  ChatMessageModel? lastMessage,
  bool? canBeDeleted,
}) =>
    ChatModel(
      id: id ?? this.id,
      messages: messages ?? this.messages,
      unreadMessages: unreadMessages ?? this.unreadMessages,
      lastUsed: lastUsed ?? this.lastUsed,
      lastMessage: lastMessage ?? this.lastMessage,
      canBeDeleted: canBeDeleted ?? this.canBeDeleted,
    );