[WIP] Working on refactor for SwipeBackLayout.java class

[brauliorivas]

Hi, my name is Braulio. I've been lately looking for a repo to improve on Github using solid principles, and I think this can have some very good improvements. I'm opening this draft PR to look for help and to try to apply these principles to the project. Specifically: Open-Closed Principle and Dependency Inversion Principle. Any help is welcome and hope maintainers support this idea.