Bug 32734: Add REST endpoint to list biblios

Bug 32734: Add REST endpoint to list biblios

This patch adds an endpoint to list biblios

To test:
1. apply patch
2. enable basic auth
3. call to GET /api/v1/biblios with the following Accept headers:
 * application/json
 * application/marcxml+xml
 * application/marc-in-json
 * application/marc
 * text/plain
4. notice how data changes with each Accept header
5. prove t/db_dependent/Koha/Biblios.t t/db_dependent/api/v1/biblios.t
6. sign off

Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Hammat Wele <hammat.wele@inlibro.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>