META: Improve quant_purger UX

Unassigning for now.

Given this one is almost done, assigning to me.

Didn't get to this so unassigning until the next batch of issues gets worked on. It's on the list for the next release:

📌 Possible targets for next release Active

After recent client questions on using the purger, here are some thoughts on improvements:

• Adding drush commands would be very helpful:
  • show path blocklist
  • show path allowlist
  • show tag blocklist
  • show tag allowlist
  • clear purger registry
  • show tags from purge table for a specific url
  • show urls from purge table for a specific tag
  • check queue for a specific url (not purger related but maybe helpful)
  • check quant logs for logs related to a specific node/term? (not purger related but maybe helpful)
• Need more information on when the purger registry needs to be cleared
• Create one or more tutorials (and/or update the docs) that steps through the process of changing configuration to handle a real-world use case such as a footer menu
• After the above, update docs to include drush commands and add any additional information
• Possibly add another message on the Purger tab explaining that all content must be reseeded when purger configuration changes

Postponing for now. If you are interested in this issue, please leave a comment.