Co-authored-by: Jan-Niklas Burfeind <github@aiyionpri.me>

This adds a new package which allows configuration of Gluons cellular
WWAN capabilities using the configuration mode. This way, a user can
enter APN information as well as the SIM PIN and enable / disable the
functionality.

Signed-off-by: David Bauer <mail@david-bauer.net>