Support Google IMAP OAUTH or Microsoft Graph API to fetch emails #1399

Google and Microsoft intend to stop support for password-based login to IMAP and POP
(https://www.bleepingcomputer.com/news/security/google-to-force-oauth-in-g-suite-to-increase-security/)

PHP IMAP extension is not supporting OAUTH tokens yet https://wiki.php.net/todo/ext/imap/xoauth2

I am creating this issue to discuss possible workarounds or future work to support mails server with IMAP OAUTH.