AppleSignInError constructor Null safety

1. irte_engine
2. apple.adapter
3. AppleSignInError
4. AppleSignInError constructor

AppleSignInError class

1. Constructors
2. AppleSignInError
3. Properties
4. hashCode
5. message
6. runtimeType
7. Methods
8. noSuchMethod
9. toString
10. Operators
11. operator ==