Add user authentication and scraper namespacing to Memorious

[sunu]

We want other people to run their own scrapers on our platform. Ideally, they will have the permissions to see, run and update their own crawlers. We will have 3 tiers of permissions for users:

• public: You can see the public crawlers; but can't run/cancel them
• authorized: You can see, run and cancel your own crawlers

• admin: God mode

  Scraper Namespacing: Scrapers should be part of a scraper group or namespace. We can figure out which namespace or group a user belongs to from req headers provided by Keycloak. The headers are put into the request by Keycloak Gatekeeper.

[sunu]

Since we got rid of the UI and memorious is now more of a CLI tool and not a platform, this issue isn't valid anymore.