FEAT: Two-way Maildir sync

[andrinoff]

Is your feature request related to a problem?

Maildir support should reconcile local changes back to the server.

Describe the solution you'd like

Synchronize flag/move/delete changes between a local Maildir and the remote server in both directions.

Describe alternatives you've considered

One-way read.

Additional context

See backend/maildir and fetcher/maildir_dispatch_test.go.

[floatpanebot]

Thanks for the suggestion!

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