Serializable constructor Null safety

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

Serializable class

1. Constructors
2. Serializable
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. asMap
8. documentSchema
9. noSuchMethod
10. read
11. readFromMap
12. toString
13. Operators
14. operator ==
15. Static properties
16. shouldAutomaticallyDocument