LDConnectionState constructor Null safety

1. launchdarkly_flutter_client_sdk
2. launchdarkly_flutter_client_sdk
3. LDConnectionState
4. LDConnectionState const constructor

LDConnectionState enum

1. Constructors
2. LDConnectionState
3. Values
4. STREAMING
5. POLLING
6. BACKGROUND_POLLING
7. BACKGROUND_DISABLED
8. OFFLINE
9. SET_OFFLINE
10. SHUTDOWN
11. Properties
12. hashCode
13. index
14. runtimeType
15. Methods
16. noSuchMethod
17. toString
18. Operators
19. operator ==
20. Constants
21. values