Add audio switch UI in sound settings

- Build two controller to control list preferences.

- MediaOutputPreferenceController which allows switching
the media output between current device and connected
BT device supporting A2DP. It also controls disabling
media output switching during a call or cast mode.

- HandsFreeProfilePreferenceController which allows
switching between HFP-connected BT devices while in
on-call state.

- Add test cases for controllers.

Bug: 74130772
Test: make RunSettingsRoboTests ROBOTEST_FILTER="MediaOutputPreferenceControllerTest" -j56
Test: make RunSettingsRoboTests ROBOTEST_FILTER="HandsFreeProfileOutputPreferenceControllerTest" -j56
Test: make RunSettingsRoboTests ROBOTEST_FILTER="AudioOutputSwitchPreferenceControllerTest" -j56

Change-Id: I37f5418442ce77e72cdff07f071ea519ab1047f3