NIMTeamUpdateFieldRequest constructor Null safety

1. nim_core
2. nim_core
3. NIMTeamUpdateFieldRequest
4. NIMTeamUpdateFieldRequest constructor

NIMTeamUpdateFieldRequest class

1. Constructors
2. NIMTeamUpdateFieldRequest
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. setAnnouncement
9. setBeInviteMode
10. setExtension
11. setIcon
12. setIntroduce
13. setInviteMode
14. setMaxMemberCount
15. setName
16. setTeamExtensionUpdateMode
17. setTeamUpdateMode
18. setVerifyType
19. toMap
20. toString
21. Operators
22. operator ==