[LBBS-32] mod_spamassassin: Improve default spam handling

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Basic enhancements:

• Add a template .sieve template for ~/.config/.sieve with default spam filtering rules for SpamAssassin... challenge is that Sieve scripts go in the maildir, but we can still make a template that new maildirs make a copy of on initialization. The default Sieve rule should move suspected spam / DMARC quarantine to Junk, and drop any mail with DMARC reject.
• When messages are moved into or out of Junk, we need to "learn" from that by running the appropriate hooks (sa-learn), e.g. see https://doc.dovecot.org/configuration_manual/spam_reporting/
• If things are being marked as junk, should also send an Abuse Report
• Junk should be purged periodically, although not nearly as frequently as the Trash, in case the user doesn't check it often

New capabilities:

• Implement some of the currently unimplemented techniques here: https://en.wikipedia.org/wiki/Anti-spam_techniques
• For greylisting, modification that would make sense might be "greylist unless IMAP recently active" (but this defeat the whole point if IMAP is always active)

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