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/subscribe

@@ -0,0 +1,49 @@
+connections: 2
+state: auth
+
+# get the separator
+1 ok list "" ""
+* list () $sep $root
+
+1 "" unsubscribe $mailbox${sep}test
+1 "" unsubscribe $mailbox${sep}test2
+1 "" unsubscribe $mailbox${sep}test2${sep}test
+1 "" unsubscribe $mailbox${sep}test3${sep}test3
+
+1 ok create $mailbox${sep}
+1 ok create $mailbox${sep}test
+1 ok create $mailbox${sep}test2${sep}
+1 ok create $mailbox${sep}test3${sep}
+1 ok create $mailbox${sep}test2${sep}test
+1 ok create $mailbox${sep}test3${sep}test3
+# create the test2 mailbox only if server supports inferior mailboxes
+1 "" create $mailbox${sep}test2
+
+1 ok subscribe $mailbox${sep}test
+1 ok subscribe $mailbox${sep}test2${sep}test
+1 ok subscribe $mailbox${sep}test3${sep}test3
+
+2 ok lsub "" $mailbox${sep}%
+* lsub () $sep $mailbox${sep}test
+#* lsub (\noselect) $sep $mailbox${sep}test2
+#* lsub (\noselect) $sep $mailbox${sep}test3
+! lsub (\noselect) $sep $mailbox${sep}test2${sep}test
+! lsub (\noselect) $sep $mailbox${sep}test3${sep}test3
+
+2 ok lsub "" *test
+* lsub () $sep $mailbox${sep}test
+* lsub () $sep $mailbox${sep}test2${sep}test
+! lsub () $sep $mailbox${sep}test3${sep}test3
+
+1 ok unsubscribe $mailbox${sep}test
+2 ok lsub "" $mailbox${sep}%
+! lsub () $sep $mailbox${sep}test
+
+1 ok unsubscribe $mailbox${sep}test2${sep}test
+2 ok lsub "" $mailbox${sep}*
+! lsub () $sep $mailbox${sep}test
+* lsub () $sep $mailbox${sep}test3${sep}test3
+
+1 ok unsubscribe $mailbox${sep}test3${sep}test3
+2 ok lsub "" $mailbox${sep}%
+! lsub () $sep $mailbox${sep}test3