Due to the move from PyJWT to authlib the error messages have changed.
Instead of mapping messages in the code just to please the tests I
changed the expücted error messages in the unit tests.

Seems like PyJWT provides a script to create JWTs from the command line.
Authlib does not provide such a script so I added this tiny script as a
replacement.

It doesn't parse parameters nor writes files but since this feature is
only required by developer while doing some local tests I'd say that's
OK.

Signed-off-by: Hannes Lerchl <hannes.lerchl@googlemail.com>

In case a server hoster doesn't use oidc or jwt there should be no need
to install authlib. So for such cases the imports need to 'come later'.

Updated poetry.lock file with --no-update

Signed-off-by: Hannes Lerchl <hannes.lerchl@googlemail.com>

Review performed by DMRobertson

Signed-off-by: Hannes Lerchl <hannes.lerchl@googlemail.com>

The pyjwt based version of the jwt login flow contained a check (like
this) for PyJWT. Since authlib is an optional dependency I add this
check when `jwt_config` is configured.

…yjwt_with_authlib