NERoomKit constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERoomKit
4. NERoomKit constructor

NERoomKit class

1. Constructors
2. NERoomKit
3. Properties
4. authService
5. hashCode
6. isInitialized
7. messageChannelService
8. roomService
9. runtimeType
10. sdkVersions
11. Methods
12. initialize
13. noSuchMethod
14. toString
15. Operators
16. operator ==
17. Static properties
18. instance