floss: metrics: HFP/AVRCP connection state handling

Route the HFP/AVRCP profiles connection events route to the metrics
processing unit. Then, parse the event into structured metrics
compatible format.

BUG: 240781725
Tag: #floss
Test: emerge-${BOARD} floss
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: Ide9664f6e333a39a5ff74b409a38b284357474cb