test/le-audio: use base builder

le-audio: add base builder

mesh: move gatt services into mesh/gatt-service folder

test/le_audio: fix past in broadcast assistant

test/le_audio: send broadcast code in broadcast assistant upon request

test/le_audio: use broadcast_audio_scan_service_client_get_source_data to access pa_sync_state field

test/le_audio: improve broadcast assistant

gatt-service/bass_service: use const, rename fields and functions, improve documentation

test/le_audio: add command to add source without starting to sync

test/le_audio: add command to send broadcast code

test/le_audio: use pts default broadcast code

test/le_audio: support manual connect mode, add command to remove source

test/le_audio: start PAST on syncinfo request, add command to trigger modify source

test/le_audio: support connect to Scan Delegator without broadcast sink

test/le_audio: fix ad data for broadcast sink

test/le_audio: fix bis sync updates

test/le_audio: support broadcast code via BASS

test/le_audio: use timeout for PAST

test/le-audio: add broadcast source to bass server

test/le_audio: update BASS Server state

gatt-service: store bis_sync and bis_sync_state separately

test/le_audio: print PAST received

test/le_audio: set hci dump paths based on device path

test/le_audio: support pairing

test/le_audio: use extended advertising, support pairing in broadcast sink