APIContact constructor Null safety

1. conduit_open_api
2. open_api_v2
3. APIContact
4. APIContact constructor

APIContact class

1. Constructors
2. APIContact
3. Properties
4. castMap
5. email
6. extensions
7. hashCode
8. name
9. referenceURI
10. runtimeType
11. url
12. Methods
13. decode
14. encode
15. noSuchMethod
16. toString
17. Operators
18. operator ==