floss: metrics: introduce event parsing for profile connection state

Add the basic handling of the profile connection state. The parsing
will happen per profile level as Floss/GD does not have a uniform
profile connection interface.

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

Change-Id: Iaf5d53ca09b83cc62cf01086d04624e1eb927d61