Bug 26297: API specs

Bug 26297: API specs

Test plan, k-t-d:
1) Access /api/v1/patron_categories
2) Verify the patron categories are correctly listed

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Bug 26297: (QA follow-up) Move to REST::V1::Patrons::Categories

Bug 26297: (QA follow-up) Use search_with_library_limits

JD amended-patch: squashed + tidy

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 0e593e59e2a39819e5384f03445a138aa79a7f34)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>