Add Bluetooth callback for device connection state changed

With the new Multi-A2DP/HFP support, need to add profile connection state
changed callback for every BT device connect/disconnect to profile.

Bug: 76447449
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=LocalBluetoothProfileManagerTest -j28
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=BluetoothEventManagerTest -j28
Change-Id: Iaaec369e8d10f9b1270491632fb5c91de1e28571
20 files changed