AutofillClient constructor Null safety

1. Flutter
2. services
3. AutofillClient
4. AutofillClient constructor

AutofillClient class

1. Constructors
2. AutofillClient
3. Properties
4. autofillId
5. hashCode
6. runtimeType
7. textInputConfiguration
8. Methods
9. autofill
10. noSuchMethod
11. toString
12. Operators
13. operator ==