Bug 35469: Add 'manage_bookings' subpermission to /checkouts

Bug 35469: Add 'manage_bookings' subpermission to /checkouts

This patch adds the 'manage_bookings' permission to allow fetching of
checkouts on the API should the user have 'manage_bookings' but not have
'circulate_remaining_permissions'

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 30b3a8c3820245c5b639818b0515f9c25c47b2c5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>