VideoPresets constructor Null safety

1. livekit_client
2. livekit_client
3. VideoPresets
4. VideoPresets constructor

VideoPresets class

1. Constructors
2. VideoPresets
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. all
13. fhd
14. hd
15. qhd
16. qvga
17. vga