describegpt: get CKAN user info if QSV_CKAN_API_TOKEN is set

[jqnatividad]

Get the user's name from CKAN.

Get it when the QSV_CKAN_API_TOKEN is provided and retrieve it using the user_show action API.

This is actually useful, not just for the HAL reference, but for getting additional context about the CKAN User:

• owned datasets
• social graph - i.e. users, topics, orgs and other datasets the user follows
• private datasets the user has access to

Originally posted by @jqnatividad in #2944