Add volume sliders domain layer

Flag: aconfig new_volume_panel DISABLED
Test: atest NotificationsSoundPolicyInteractorTest
Test: atest AudioVolumeInteractorTest
Test: atest VolumeSliderInteractorTest
Fixes: 318349141
Change-Id: I4dbaa52972fd4103b138f7954a250a2245804593
19 files changed