Fix - Fix schema/components output_validators for multiple fields

[mjanez]

Internally all extra fields are stored as strings. If you are attempting to save and restore other types of data you will need to use output validators.

For example if you use a simple "yes/no" question, you will need to let ckanext-scheming know that this data needs to be stored and retrieved as a boolean. This is acheieved using validators and output_validators keys.

 - field_name: is_camel_friendly
   label: Is this camel friendly?
   required: true
   preset: select
   choices:
     - value: false
       label: "No"
     - value: true
       label: "Yes"
   validators: scheming_required boolean_validator
   output_validators: boolean_validator

Info: https://github.com/ckan/ckanext-scheming#output_validators

Schemas

• [ ] Fix all multiple fields in custom schemas.
  • [ ] DCAT
  • [ ] DCAT-AP
  • [ ] GeoDCAT-AP (EU/ES)

Components of ckan-docker deployment

• [ ] ckan-docker: Check API actions like package_show.
• [ ] ckan-ogc: Check ingested JSON Lists.
• [ ] ckan-pycsw: Check harvested JSON Lists.