statuses property Null safety

1. sendbird_sdk
2. scheduled_message_total_count_params
3. TotalScheduledMessageCountParams
4. statuses property

TotalScheduledMessageCountParams class

1. Constructors
2. TotalScheduledMessageCountParams
3. Properties
4. channelType
5. channelUrl
6. hashCode
7. messageType
8. runtimeType
9. senderId
10. statuses
11. Methods
12. noSuchMethod
13. toJson
14. toString
15. Operators
16. operator ==