Bug 30394: Add x-koha-request-id support on API routes

Bug 30394: Add x-koha-request-id support on API routes

This patch adds the x-koha-request-id to all GET routes that rely on
objects.search, for immediate support for the header.

The patch itself is trivial:
- It adds the header parameter definition to the top level swagger.yaml
- It adds a reference on each route that already implements q params,
  etc

To test:
1. Apply the patch
2. Reload plack
3. Notice the API still works
4. Run:
   $ kshell
  k$ prove t/db_dependent/api/v1/query.t
=> SUCCESS: It now passes! The /cities route implements the
x-koha-request-id header pass through.
5. Run the rest of the API tests
=> SUCCESS: All good
6. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>