Add more statistics to scan logs

Added length of connection time to connections. Also added scan type
(opportunistic/background) to last X scans.

Example of new print:
GATT Client Map
  Entries: 2

  no.nordicsemi.android.mcp (Registered)
  LE scans (started/stopped)         : 2 / 2
  Scan time in ms (min/max/avg/total): 1604 / 7274 / 4439 / 8878
  Last 2 scans                       :
    1970/02/19 21:30:20 - 1604ms
    1970/02/19 23:59:00 - 7274ms
  Application ID                     : 6
  UUID                               : 0c452531-a57e-44df-9ac6-e2b780d2f715
  Connections: 1
    6: FF:08:11:53:44:A1 10008ms

  com.example.apanicke.bletest (Registered)
  LE scans (started/stopped)         : 2 / 2
  Scan time in ms (min/max/avg/total): 2946 / 9996 / 6471 / 12942
  Last 2 scans                       :
    1970/02/19 21:30:07 - 2946ms Opp
    1970/02/19 21:30:17 - 9996ms Opp
  Application ID                     : 5
  UUID                               : f25c1bdf-559f-43a6-8348-40ca92975b33
  Connections: 0

Bug: 27294154
Change-Id: I7460fb1568f20a1ce13b01d101517852cf9aec4a