Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

tests/resources/imap-test/notify

@@ -0,0 +1,20 @@
+capabilities: notify qresync
+
+ok create ${mailbox}2
+ok append ${mailbox}2
+
+#
+# Check that initial STATUS notifications are sent when needed
+#
+
+ok notify set status (mailboxes ${mailbox}2 (MessageExpunge))
+* status ${mailbox}2 (messages 1)
+
+ok notify set status (mailboxes ${mailbox}2 (MessageNew))
+* status ${mailbox}2 (messages 1 uidnext $uidnext uidvalidity $uidvalidity)
+
+ok notify set status (mailboxes ${mailbox}2 (FlagChange))
+* status ${mailbox}2 (uidvalidity $uidvalidity highestmodseq $hmodseq)
+
+ok notify set (mailboxes ${mailbox}2 (MessageNew MessageExpunge FlagChange))
+! status ${mailbox}2 ()