MediaInfo constructor Null safety

1. flutter_cast_framework
2. cast
3. MediaInfo
4. MediaInfo constructor

MediaInfo class

1. Constructors
2. MediaInfo
3. Properties
4. contentId
5. contentType
6. customDataAsJson
7. hashCode
8. mediaMetadata
9. mediaTracks
10. runtimeType
11. streamDuration
12. streamType
13. Methods
14. encode
15. noSuchMethod
16. toString
17. Operators
18. operator ==
19. Static methods
20. decode