NERoomVirtualBackgroundSourceStateReason constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERoomVirtualBackgroundSourceStateReason
4. NERoomVirtualBackgroundSourceStateReason constructor

NERoomVirtualBackgroundSourceStateReason class

1. Constructors
2. NERoomVirtualBackgroundSourceStateReason
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. kColorFormatNotSupported
13. kDeviceNotSupported
14. kImageFormatNotSupported
15. kImageNotExist
16. kSuccess