controller property Null safety

1. jrpn
2. controller
3. StackLiftEnabledUser
4. controller property

StackLiftEnabledUser class

1. Constructors
2. StackLiftEnabledUser
3. Properties
4. controller
5. hashCode
6. runtimeType
7. stackLiftEnabled
8. Methods
9. noSuchMethod
10. toString
11. Operators
12. operator ==