QuerySortOrder constructor Null safety

1. conduit_core
2. conduit
3. QuerySortOrder
4. QuerySortOrder const constructor

QuerySortOrder enum

1. Constructors
2. QuerySortOrder
3. Values
4. ascending
5. descending
6. Properties
7. hashCode
8. index
9. runtimeType
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Constants
16. values