RTCVideo constructor Null safety

1. volc_engine_rtc
2. bytertc_video_api
3. RTCVideo
4. RTCVideo constructor

RTCVideo class

1. Constructors
2. RTCVideo
3. Properties
4. audioMixingManager
5. hashCode
6. runtimeType
7. Methods
8. checkVideoEffectLicense
9. clearVideoWatermark
10. createRTCRoom
11. destroy
12. enableAudioPropertiesReport
13. enableEffectBeauty
14. enableExternalSoundCard
15. enablePlaybackDucking
16. enableSimulcastMode
17. enableVideoEffect
18. enableVocalInstrumentBalance
19. feedback
20. getAudioRoute
21. getCameraZoomMaxRatio
22. getPeerOnlineStatus
23. isCameraExposurePositionSupported
24. isCameraFocusPositionSupported
25. isCameraTorchSupported
26. isCameraZoomSupported
27. login
28. logout
29. muteAudioPlayback
30. noSuchMethod
31. registerFaceDetectionObserver
32. removeLocalVideo
33. removePublicStreamVideo
34. removeRemoteVideo
35. sendScreenCaptureExtensionMessage
36. sendSEIMessage
37. sendServerBinaryMessage
38. sendServerMessage
39. sendStreamSyncInfo
40. sendUserBinaryMessageOutsideRoom
41. sendUserMessageOutsideRoom
42. setAudioProfile
43. setAudioRoute
44. setAudioScenario
45. setBackgroundSticker
46. setBeautyIntensity
47. setBusinessId
48. setCameraExposureCompensation
49. setCameraExposurePosition
50. setCameraFocusPosition
51. setCameraTorch
52. setCameraZoomRatio
53. setCaptureVolume
54. setDefaultAudioRoute
55. setEarMonitorMode
56. setEarMonitorVolume
57. setEncryptInfo
58. setLocalVideoMirrorType
59. setLocalVoicePitch
60. setMaxVideoEncoderConfig
61. setPlaybackVolume
62. setPublishFallbackOption
63. setRemoteAudioPlaybackVolume
64. setRemoteUserPriority
65. setRTCVideoEventHandler
66. setRuntimeParameters
67. setScreenAudioStreamIndex
68. setScreenVideoEncoderConfig
69. setServerParams
70. setSubscribeFallbackOption
71. setVideoCaptureConfig
72. setVideoEffectAlgoModelPath
73. setVideoEffectColorFilter
74. setVideoEffectColorFilterIntensity
75. setVideoEffectNodes
76. setVideoEncoderConfig
77. setVideoOrientation
78. setVideoRotationMode
79. setVideoWatermark
80. setVoiceChangerType
81. setVoiceReverbType
82. startASR
83. startAudioCapture
84. startCloudProxy
85. startEchoTest
86. startFileRecording
87. startLiveTranscoding
88. startNetworkDetection
89. startPlayPublicStream
90. startPushPublicStream
91. startPushSingleStreamToCDN
92. startScreenCapture
93. startVideoCapture
94. stopASR
95. stopAudioCapture
96. stopCloudProxy
97. stopEchoTest
98. stopFileRecording
99. stopLiveTranscoding
100. stopNetworkDetection
101. stopPlayPublicStream
102. stopPushPublicStream
103. stopPushStreamToCDN
104. stopScreenCapture
105. stopVideoCapture
106. switchCamera
107. toString
108. updateLiveTranscoding
109. updateLoginToken
110. updatePublicStreamParam
111. updateScreenCapture
112. updateVideoEffectNode
113. Operators
114. operator ==
115. Static methods
116. createRTCVideo
117. getErrorDescription
118. getSdkVersion