Allow token janitor to run token owner queries

[stavros-souvatzis]

In certain cases, shared user accounts may get to have a big number of assigned tokens. I've seen cases with more than 50 tokens per account.

By leveraging the existing functionality, to be able to find tokens that haven't been used for more than XXX, we could also add owner information to the query.

There is already the tokeninfo query, adding a tokenowner query would greatly improve this functionality.

For example

privacyidea-token-janitor find --tokenowner-key user_id --tokenowner-value 642cf598-d9cf-1037-8083-a1df7d38c897 --last_auth 180d --action disable

[github-actions]

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[cornelinux]

We would also need the resolver, to find the corresponding valu ein the tokenowner table.
However, when specifiying the user_id this is fine, since we would not need a resolver-request to e.g. LDAP.