draft constant Null safety

1. wings_data_model
2. wings_data_model
3. CarePlanStatus
4. draft constant

CarePlanStatus class

1. Properties
2. hashCode
3. name
4. runtimeType
5. Methods
6. noSuchMethod
7. toString
8. Operators
9. operator ==
10. Static properties
11. serializer
12. values
13. Static methods
14. valueOf
15. Constants
16. active
17. completed
18. draft
19. enteredInError
20. onHold
21. revoked
22. unknown