define fromJson ,fromMap with key

When my class is extending `HiveObject` I have access to `key` using the getter defined in `HiveObject` but after sending the class instance through the network as json I need to convert it back to a model using `Model.fromMap(Map map)` but I can't set the key since it is private and the `HiveObjectMixin` is not defining a setter

```dart
class User extends HiveObject {
final String name;

User({required this.name});

factory User.fromMap(Map map) {
return User(
name: map['name'], // <