ChatRoomManagerListener constructor Null safety

1. agora_chat_sdk
2. agora_chat_sdk
3. ChatRoomManagerListener
4. ChatRoomManagerListener constructor

ChatRoomManagerListener class

1. Constructors
2. ChatRoomManagerListener
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. onAdminAddedFromChatRoom
9. onAdminRemovedFromChatRoom
10. onAllChatRoomMemberMuteStateChanged
11. onAllowListAddedFromChatRoom
12. onAllowListRemovedFromChatRoom
13. onAnnouncementChangedFromChatRoom
14. onChatRoomDestroyed
15. onMemberExitedFromChatRoom
16. onMemberJoinedFromChatRoom
17. onMuteListAddedFromChatRoom
18. onMuteListRemovedFromChatRoom
19. onOwnerChangedFromChatRoom
20. onRemovedFromChatRoom
21. toString
22. Operators
23. operator ==