Transformation constructor Null safety

1. cloudinary_url_gen
2. transformation
3. Transformation
4. Transformation constructor

Transformation class

1. Constructors
2. Transformation
3. Properties
4. components
5. hashCode
6. runtimeType
7. Methods
8. add
9. addTransformation
10. adjust
11. border
12. build
13. delivery
14. effect
15. generic
16. namedTransformation
17. noSuchMethod
18. resize
19. rotate
20. roundCorners
21. toString
22. transcode
23. videoEdit
24. Operators
25. operator ==