Remove DMs and ban sender users command

[melroy89]

Reducing spam messages (like the infamous fediverse chick) by introducing a command. Meaning admins no longer need to use manual DB queries. Its just simpler.

This new command (./bin/console mbin:messages:remove_and_ban), allows you to easily search on direct messages. And remove all the matched messages and ban the senders user from the instance.

Hint: If you want to search on strings with spaces its just a shell script basically, so use quotes around the body query in those cases and it will work fine:

./bin/console mbin:messages:remove_and_ban "Fediverse Chick"

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1. Search query is executed. And displayed in a very nice ASCII table:
   
2. User input requested to continue:
   
3. If y(es), then we continue with banning the users and removing the direct messages.

[melroy89]

Documentation follow up PR: #1515