[SUGGESTION] Put classes and interfaces to proper package based on Android MVVM Architecture.

[bentleypark]

Description feedback/suggestion
Before going furthuer(fix bugs or add more features), I guess this job should be done on priority.
And all business logics need to move out to viewmodel layer from view layer.

Draft expected
https://developer.android.com/jetpack/guide
https://github.com/android/sunflower/tree/main/app/src/main/java/com/google/samples/apps/sunflower

[Sav22999]

@MrIndeciso