Bug 29543: Add JWT token handling

Bug 29543: Add JWT token handling

Mojo::JWT is installed already, it's not a new dependency.
We need a way to send the patron a token when it's correctly logged in,
and not assumed it's logged in only if patronid is passed

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit d978bf1506d761a6962d949f35b71f1740d0052a)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>