monitor: Add support for Set Appearance mgmt command

@ MGMT Command: Set Appearance (0x0043) plen 2        {0x0002}
        Appearance: Blood Pressure (0x0380)
@ MGMT Event: Command Complete (0x0001) plen 3        {0x0002}
      Set Appearance (0x0043) plen 0
        Status: Success (0x00)
1 file changed