ValidationContext constructor Null safety

1. conduit_core
2. conduit
3. ValidationContext
4. ValidationContext constructor

ValidationContext class

1. Constructors
2. ValidationContext
3. Properties
4. errors
5. event
6. hashCode
7. isValid
8. property
9. runtimeType
10. state
11. Methods
12. addError
13. noSuchMethod
14. toString
15. Operators
16. operator ==