BLE audio: support assigning volume at BLE device connection

Add support for associating an initial volume with a BLE
connection:
- add volume info to BluetoothProfileConnectionInfo in a new
BLE output factory method
- when handling device connection for BLE, also check if
volume information from the connection information is available.

Bug: 233975367
Test: atest frameworks/base/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/unit/BluetoothProfileConnectionInfoTest.java
Change-Id: Ib54267727bc4d47e6999f2b84eab805f23c4955a
Merged-In: Ib54267727bc4d47e6999f2b84eab805f23c4955a