Create integration for OpenPGP certificates with multiple component keys
With !19 (merged) we currently only support OpenPGP certificates with a single component key. This is usually enough for our signing setup, but in the future it would be great to be able to support OpenPGP certificates with multiple component keys.
A setup like that requires us to assign multiple NetHSM keys to the use of an OpenPGP certificate and encode the key IDs of the component keys in the certificate.