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/select

@@ -0,0 +1,33 @@
+state: created
+
+ok append
+ok append
+
+# first open read-only so recent flags don't get lost
+examine $mailbox
+* 2 exists
+#* 2 recent
+#* ok [unseen 1]
+* ok [uidvalidity $uidvalidity]
+* ok [uidnext $uidnext]
+ok [read-only]
+
+ok close
+
+# check that STATUS replies with the same values
+ok status $mailbox (messages uidnext uidvalidity unseen)
+* status $mailbox (messages 2 uidnext $uidnext uidvalidity $uidvalidity unseen 2)
+
+# then try read-write
+select $mailbox
+* 2 exists
+#* 2 recent
+#* ok [unseen 1]
+* ok [uidvalidity $uidvalidity]
+* ok [uidnext $uidnext]
+ok [read-write]
+
+ok close
+
+#ok status $mailbox (recent)
+#* status $mailbox (recent 0)