Favorites list UI

[JoaquimLey]

In order to facilitate the user, we should add the ability to save favorite stations. Depends on #17

• Make it easy UX-wise to make these same favorite requests (MD2.0).

Tasks ⚙

• Convert to dynamic feature module

  https://proandroiddev.com/dynamic-feature-module-android-ondemand-module-android-app-bundle-ea0d872b32d

• Display fetched favorites on the list depends on -> MVP: Display service-specific SMS on a list #13

• Ability to add a favorite to the favorites list

• Ability to remove a favorite

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• Instrumentation tests

• Unit tests

[JoaquimLey]

Just a reference to the UI-Tests when developing this issue: https://stackoverflow.com/questions/49833533/how-to-correctly-mock-viewmodel-on-androidtest