pay constant Null safety

1. wings_data_model
2. wings_data_model
3. OrganizationType
4. pay constant

OrganizationType 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. bus
17. cg
18. crs
19. dept
20. edu
21. govt
22. ins
23. other
24. pay
25. prov
26. reli
27. team