Fit constructor Null safety

1. cloudinary_url_gen
2. fit
3. Fit
4. Fit constructor

Fit class

1. Constructors
2. Fit
3. Properties
4. actionType
5. dimensions
6. hashCode
7. regionRelative
8. relative
9. runtimeType
10. Methods
11. aspectRatio
12. height
13. noSuchMethod
14. params
15. toString
16. width
17. Operators
18. operator ==