Support Manager: Add support for importing tickets from Google and Microsoft with oauth2

Google is phasing out standard username/password authentication in favor of oauth2.

This option will appear when editing or creating a new department under the "Email Handling" dropdown. While Google supports POP, the authentication method is different. I suggest we add 2 new options to the Email Handling dropdown:

• Google
• Microsoft

Google

We will need at least the following fields:

• Host
• Port
• Client ID
• Client Secret
• Connection Token

We will need to also display a Redirect URL for OAuth2.

Microsoft

• Application ID
• Client Secret
• Connection Token

We will need to display a Redirect URL for OAuth2 here also.

The above is based on my understanding of other integrations.

Potentially useful documentation:
https://developers.google.com/gmail/imap/xoauth2-protocol
https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth