Refactoring for bluetooth dialogs

Dialogs displayed when attempting to connect
to a bluetooth device have been refactored so
that they use a proper dialog fragment. Hardware
dependencies have also been refactored into a
controller class to make it possible to test
these dialogs as well as the controller
independently of one another.

Test: RoboTests
Bug: 32180625
Change-Id: I5447f8299bc13e139052635fc63546cbfc997f33