PushTokenRegistrationStatus constructor Null safety

1. sendbird_sdk
2. enums
3. PushTokenRegistrationStatus
4. PushTokenRegistrationStatus const constructor

PushTokenRegistrationStatus enum

1. Constructors
2. PushTokenRegistrationStatus
3. Values
4. success
5. pending
6. error
7. Properties
8. hashCode
9. index
10. runtimeType
11. Methods
12. noSuchMethod
13. toString
14. Operators
15. operator ==
16. Constants
17. values