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/scripts/imap_import_single.py

@@ -0,0 +1,27 @@
+import imaplib
+import socket
+import time
+from email.message import Message
+from email.utils import formatdate
+from datetime import datetime, timedelta
+
+conn = imaplib.IMAP4('localhost')
+conn.login('john', '12345')
+conn.socket().setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+current_date = datetime.now()
+timestamp = current_date.timestamp()
+
+msg = Message()
+msg['From'] = '[email protected]'
+msg['To'] = '[email protected]'
+msg['Message-Id'] = f'unique.message.id.{current_date}@nowhere'
+msg['Date'] = formatdate(time.mktime(current_date.timetuple()), localtime=False, usegmt=True)
+msg['Subject'] = f"This is message #{timestamp}"
+msg.set_payload('...nothing...')
+
+response_code, response_details = conn.append('INBOX', '', imaplib.Time2Internaldate(time.mktime(current_date.timetuple())), str(msg).encode('utf-8'))
+if response_code != 'OK':
+    print(f'Error while appending message: {response_code} {response_details}')
+
+print("Message appended.")
+conn.logout()