FEAT: Fast resync with CONDSTORE / QRESYNC

[andrinoff]

Is your feature request related to a problem?

Resyncing folders re-scans more than necessary on reconnect.

Describe the solution you'd like

Use CONDSTORE/QRESYNC (MODSEQ) to fetch only changes since the last sync.

Describe alternatives you've considered

Full rescans.

Additional context

See backend/imap and fetcher/fetcher.go.

[floatpanebot]

Thanks for the suggestion!

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