floss: metrics: gather and emit remote device info metrics

These are emitted when device is connected and when we receive a new
property. The behavior is a bit different than the existing one in
BlueZ, but it wouldn't matter much since duplicates are removed by
the backend service.

Bug: 240782193
Tag: #floss
Test: Verify DeviceInfoReport are logged upon connection and upon
      restarting floss.

BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: I9d63cb04ae228a79033557d9d681c5a29d58438d