TRTCCloud constructor Null safety

1. tencent_trtc_cloud
2. trtc_cloud
3. TRTCCloud
4. TRTCCloud constructor

TRTCCloud class

1. Constructors
2. TRTCCloud
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. callExperimentalAPI
8. connectOtherRoom
9. disconnectOtherRoom
10. enableAudioVolumeEvaluation
11. enableEncSmallVideoStream
12. enterRoom
13. exitRoom
14. getAudioCaptureVolume
15. getAudioEffectManager
16. getAudioPlayoutVolume
17. getBeautyManager
18. getDeviceManager
19. getSDKVersion
20. muteAllRemoteAudio
21. muteAllRemoteVideoStreams
22. muteLocalAudio
23. muteLocalVideo
24. muteRemoteAudio
25. muteRemoteVideoStream
26. noSuchMethod
27. pauseScreenCapture
28. registerListener
29. resumeScreenCapture
30. sendCustomCmdMsg
31. sendSEIMsg
32. setAudioCaptureVolume
33. setAudioPlayoutVolume
34. setConsoleEnabled
35. setDefaultStreamRecvMode
36. setGSensorMode
37. setLocalRenderParams
38. setLogCompressEnabled
39. setLogDirPath
40. setLogLevel
41. setMixTranscodingConfig
42. setNetworkQosParam
43. setRemoteAudioVolume
44. setRemoteRenderParams
45. setRemoteVideoStreamType
46. setVideoEncoderMirror
47. setVideoEncoderParam
48. setVideoEncoderRotation
49. setVideoMuteImage
50. setWatermark
51. showDebugView
52. snapshotVideo
53. startAudioRecording
54. startLocalAudio
55. startLocalPreview
56. startLocalRecording
57. startPublishCDNStream
58. startPublishing
59. startRemoteView
60. startScreenCapture
61. startSpeedTest
62. stopAllRemoteView
63. stopAudioRecording
64. stopLocalAudio
65. stopLocalPreview
66. stopLocalRecording
67. stopPublishCDNStream
68. stopPublishing
69. stopRemoteView
70. stopScreenCapture
71. stopSpeedTest
72. switchRole
73. switchRoom
74. toString
75. unRegisterListener
76. unregisterTexture
77. updateLocalView
78. updateRemoteView
79. Operators
80. operator ==
81. Static properties
82. listener
83. Static methods
84. destroySharedInstance
85. getPlatformVersion
86. sharedInstance