Update the default set configuration file and format.

New format eliminates the need for allocation and
deduplicates many configurations.
We change the file name of the default set configuration
for intergration with vendor's configuration.

We also support storing the configuration name in
the vendor's metadata for easier debugging.

Bug: 331490291
Test: atest VtsHalBluetoothAudioTargetTest
Change-Id: I0f6cfbdad1da05c35d7c758c69d7030527e1f46a