Add hearing device related logs in Settings

1. The HAC toggle on/off event
2. The "See more devices" button click in hearing device pairing page
3. The preset changed event in Bluetooth device details page

Flag: EXEMPT, simple log
Bug: 361206470
Test: manually check on go/atomviewer
Test: atest BluetoothDetailsHearingAidsPresetsControllerTest
Change-Id: I743ea136ec4cb3370c0463df865db830e73e7997