[enhancement]: stalwart-cli import messages - map folders

[DSpeichert]

Which feature or improvement would you like to request?

I'd like to see this feature: stalwart-cli import messages would be better if it could map folders like imapsync can - especially for Junk, Sent or Trash.

Is your feature request related to a problem?

Currently, stalwart-cli import messages will copy folders exactly as they appear, often resulting in Junk/Sent/Trash folders existing twice (as they are often named depending on the server).

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