ImapGoose: detecting wake-up from sleep

After the system goes into sleep and wakes up again, ImapGoose would just hang for like 15–20 minutes before finally detecting the disconnection and reconnect. This was super annoying, and understanding the root cause was not trivial at all. ImapGoose sends a NOOP to the server every three minutes. This NOOP is basically like a ping to which the server must reply. The timeout it set to thirty…