Added user and consumer roles

Merged Felix Delattre requested to merge feature/add-basic-users into master

This MR introduces two new users with their roles:

  • user with the permission to view, add, modify and delete data, but not creating or changing tables and their structure.
  • consumer with the only permission to view the data (useful for tile generators, the connection from QGIS, etc.).

\approve @prehn @ds \fyi

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