FinderExtension constructor Null safety

1. Flutter
2. flutter_driver_extension
3. FinderExtension
4. FinderExtension constructor

FinderExtension class

1. Constructors
2. FinderExtension
3. Properties
4. finderType
5. hashCode
6. runtimeType
7. Methods
8. createFinder
9. deserialize
10. noSuchMethod
11. toString
12. Operators
13. operator ==