Add Hearing Aid UI into Settings-Accessibility App

- dynamically show/hide preference by HearingAid profile is supported or not
- add AccessibilityHearingAidPreferenceController to handle hearingAid preference
- add HearingAidDialogFragment to handle dialog behavior

Bug: 109948484
Test: make -j50 RunSettingsRoboTests

Change-Id: Ic55dde475dc40311f7e652f4a86d342597f09f0e