Add scan results to scan stats

Ex:
GATT Client Map
  Entries: 1

  no.nordicsemi.android.mcp
  LE scans (started/stopped)         : 3 / 3
  Scan time in ms (min/max/avg/total): 3050 / 6901 / 4815 / 14447
  Total number of results            : 338
  Last 3 scans                       :
    1970/01/01 08:20:06 - 6901ms 0 results
    1970/01/01 08:20:13 - 4496ms 171 results
    1970/01/01 08:20:39 - 3050ms 167 results

Bug: 27294154
Change-Id: I32fd6da035f2c37302a105733ac6a9817547b7a3