Bug 34008: Add REST endpoint for list of itemtypes

Bug 34008: Add REST endpoint for list of itemtypes

Test plan:
* Enable the system preference RESTBasicAuth
* curl -s --request GET http://kohadev-intra.mydnsname.org:8081/api/v1/itemtypes
  should give 401 Unauthorized
* curl -s -u koha:koha --request GET http://kohadev-intra.mydnsname.org:8081/api/v1/itemtypes
  should produce JSON-list of itemtypes
* curl -s -u koha:koha --header "x-koha-embed: translated_descriptions" --request GET http://kohadev-intra.mydnsname.org:8081/api/v1/itemtypes
  should include the field translated_descriptions containing the translated descriptions, if any

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
[EDIT] perltidy -b t/db_dependent/api/v1/itemtypes.t # Resolve bad score of 44
[EDIT] chmod 755 t/db_dependent/api/v1/itemtypes.t
[EDIT] perltidy -b Koha/REST/V1/ItemTypes.pm
Lesson: Please run qa tools yourself and adjust accordingly?
Edit (tcohen): I restored the item_type_translated_description.yaml file
as the entire API was broken because of the lack of it.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>