New handling of delete message arguments on mod actions

We could also consider allowing people to specify other intervals in commands such as `[p]ban`, `[p]massban`, and `[p]tempban` though in the `[p]tempban` case it may make the parameter syntax more ambiguous due to temp ban duration and delete seconds allowing the same syntax (timedelta converter). Since it's not a very clear cut, I recommend that you make an issue for that where we can discuss it further.

_Originally posted by @Jackenmen in https://github.com/Cog-Creators/Red-DiscordBot/pull/5920#pullrequestreview-1202799441_

Start by reviewing the discussion from PR #5920 and the command arguments for [p]ban, [p]massban, and [p]tempban. Work out whether additional delete-message intervals are wanted and how to distinguish delete seconds from the temp-ban duration; done requires an agreed, unambiguous command syntax.

Written by the indexing model from the issue text.