Add two tabs to the ringtone picker pop-up view.

We're converting the AlertDialog to a DialogFragment with a ViewPage and two tabs (Sound and Vibration). The Vibration tab will be empty for now, while the Sound tab will include a recyclerview with all available sounds.

Fix: 275541592
Test: com.android.soundpicker.RingtonePickerViewModelTest
Change-Id: Idda019d2ef460785d2b2fd9df35858d4650829fc