Bug 13903: Add API routes to list, create, update, delete reserves

Bug 13903: Add API routes to list, create, update, delete reserves

GET    /reserves?borrowernumber=X (list)
POST   /reserves                  (create)
PUT    /reserves/{reserve_id}     (update)
DELETE /reserves/{reserve_id}     (delete)

Unit tests in t/db_dependent/api/v1/reserves.t

Test plan:
1. Apply patch
2. Run unit tests
3. Play with the API with your favorite REST client, using documentation
   in the swagger.json file
4. Try to make reserves until the maximum number of reserves for a user
   is reached (you should have a 403 error)

Depends on bug 15126

Signed-off-by: Benjamin Rokseth <benjamin.rokseth@kul.oslo.kommune.no>
Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>