[enhancement]: Ability to remove messages older than X

Which feature or improvement would you like to request?

I'd like to see this feature:

An API endpoint similar to: "doveadm expunge mailbox Inbox savedbefore 30d -u " would be great.

That we can run on mailboxes and remove messages older than X for any given folder. This would help create retention policies.

Is your feature request related to a problem?

I'm having a problem with...

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