NERoomRtcController constructor Null safety

1. yunxin_roomkit
2. roomkit
3. NERoomRtcController
4. NERoomRtcController constructor

NERoomRtcController class

1. Constructors
2. NERoomRtcController
3. Properties
4. hashCode
5. isSupported
6. runtimeType
7. Methods
8. addAttachment
9. clearAttachments
10. enableAudioVolumeIndication
11. getAttachment
12. getScreenSharingUserUuid
13. isSpeakerphoneOn
14. joinRtcChannel
15. leaveRtcChannel
16. muteMemberAudio
17. muteMemberVideo
18. muteMyAudio
19. muteMyVideo
20. noSuchMethod
21. removeAttachment
22. setSpeakerphoneOn
23. startAudioDump
24. startPreview
25. startScreenShare
26. stopAudioDump
27. stopMemberScreenShare
28. stopPreview
29. stopScreenShare
30. subscribeRemoteSubStreamVideo
31. subscribeRemoteVideoStream
32. switchCamera
33. toString
34. unmuteMemberAudio
35. unmuteMemberVideo
36. unmuteMyAudio
37. unmuteMyVideo
38. unsubscribeRemoteSubStreamVideo
39. unsubscribeRemoteVideoStream
40. Operators
41. operator ==