Add Oauth2 support for outbound email over SMTP

[CHJESSON]

As at version 22.1 Chorus only supports Basic Auth for SMTP.
Support for OAuth2 authentication was added for IMAP4 in Chorus Capture a few years back in order to ensure forward compatibility with Exchange365, for which Microsoft have mandated they are removing support for Basic Auth for IMAP4/POP3 (as of Oct 2022).
Microsoft have not yet given an end-of-support date for SMTP with Basic Auth for Exchange365, due to the very long tail of applications that use SMTP and can't easily be updated to use OAuth2.
However, in order to keep up to date with best practice for protocol security, we should add OAuth2 support for SMTP to the product set

Affected Chorus BPM components:

• Communications
• AWD Email Service
• Fax Out
• WebFOCUS (report distribution via email, email notifications)

Business drivers/considerations for this enhancement:

1. Clients' security teams start mandating that SMTP should only be used in conjunction with OAuth2, not Basic Auth
2. Microsoft announce a sunset date for SMTP/Basic Auth, after which any enhancement would be against an externally-imposed deadline

[findern]

This enhancement is planned for release with Chorus 23.1.