Review access configration

# Overview

Currently, the Data Package endpoint uses the same approach regarding auth as `ckanext-dcat` - https://github.com/ckan/ckanext-dcat/blob/master/ckanext/dcat/logic.py#L211. On non-authorized access, it seems to be returning a 500 error. It needs to be reviewed but in-general it is probably fine to do exactly what `ckanext-dcat` does as it's already battle-tested extension.