OAuth 2.0 authentication Completed

Google announced that sending emails via a Google SMTP servers based on a username and a password (they call it "less secure apps") will only be supported until 2021-02-15. Instead, OAuth 2.0 authentication is required (see
https://developers.google.com/identity/protocols/OAuth2). Therefore, it would be awesome if GemBox.Email could support the OAuth 2.0 authentication.