floss: metrics: parse and upload bond state event

Add bond state event parsing to map/match the ChromeOS libstructured
schema. Add debug logging before metrics submission.

BUG: 232098615
Tag: #floss
Test: emerge-${BOARD} floss
Test: ./build.py
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: I08d7b90ee98e63e31f1266653eac1162bcfa9806