NERoomService constructor Null safety

1. yunxin_roomkit
2. roomkit
3. NERoomService
4. NERoomService constructor

NERoomService class

1. Constructors
2. NERoomService
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. createRoom
8. getRoomContext
9. joinRoom
10. noSuchMethod
11. toString
12. Operators
13. operator ==