status property Null safety

1. Flutter
2. animation
3. Animation<T>
4. status property

Animation class

1. Constructors
2. Animation
3. fromValueListenable
4. Properties
5. hashCode
6. isCompleted
7. isDismissed
8. runtimeType
9. status
10. value
11. Methods
12. addListener
13. addStatusListener
14. drive
15. noSuchMethod
16. removeListener
17. removeStatusListener
18. toString
19. toStringDetails
20. Operators
21. operator ==