PractitionerBuilder constructor Null safety

1. wings_data_model
2. wings_data_model
3. PractitionerBuilder
4. PractitionerBuilder constructor

PractitionerBuilder class

1. Constructors
2. PractitionerBuilder
3. Properties
4. avatar
5. birthday
6. country
7. email
8. fcmToken
9. fcmTokenDateTime
10. firebaseUid
11. firstName
12. gender
13. hashCode
14. id
15. interests
16. isCrashlyticsAllowed
17. isMedicalProfileMiningAllowed
18. isOpenForThirdPartyContacts
19. language
20. lastName
21. mobilePhone
22. roles
23. runtimeType
24. userId
25. zipCode
26. Methods
27. build
28. noSuchMethod
29. replace
30. toString
31. update
32. Operators
33. operator ==