global: review CLI for invenio-access

[lnielsen]

1. Do we need an invenio access init command?
2. Do we need an invenio access permissions <user> command to list which actions are allowed/denied for a given user.

[jmartinm]

1. Do we need an invenio access init command?

What will that command do?

2. Do we need an invenio access permissions <user> command to list which actions are allowed/denied for a given user.

I think that is useful when adding some permissions on the server, in order to first double check the permissions the user has.

[nharraud]

Same as @jmartinm.

I can start working on invenio access permissions <user> if it's decided.