ratbagctl: implement list-devices and show-device
ratbagctl: implement list-devices and show-device

Two new verbs for ratbagctl:
 - list-devices: list all available devices
 - show-device: show detailed information about a single device

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

libratbag/libratbag,libratbag/libratbag,libratbag/libratbag,whot/libratbag,whot/libratbag,whot/libratbag