OPP: Add dumpsys output

Dump the size and direction for recent shares.

Profile: BluetoothOppService
  Shares:
    12.20@15:24:25: -> 27/27B
    12.20@15:42:00: <- 1647024/1647024B
    12.20@16:12:54: <- 1116437/1116437B
    12.21@07:24:38: <- 1752058B/3067823

Test: adb shell dumpsys bluetooth_manager
Change-Id: Ia87638d50de69a8cda4ca65d0fb3fc9710ec94e9