🚀: Add support for changing the default IMAP listener greeting

[neosonic2]

Which feature or improvement would you like to request?

I'd like to have the ability to customize the greeting sent by the IMAP/IMAPS listener to connecting clients. It's already possible to set the SMTP listener greeting by changing the server.listener.<id>.greeting configuration attribute.

Right now, when I connect to the IMAPS listener, I get:

* OK [CAPABILITY IMAP4rev2 IMAP4rev1 ENABLE SASL-IR LITERAL+ ID UTF8=ACCEPT AUTH=OAUTHBEARER AUTH=PLAIN] Stalwart IMAP4rev2 at your service.

Obviously this is not a super important feature, but instead more of a "nice to have", especially since I just set up a cluster of four Stalwart servers behind a load balancer and I'd like to put the current server's hostname in the IMAP greeting message, as I currently do for SMTP, to make troubleshooting easier.

Note: This feature request stems from discussion #1214.

Is your feature request related to a problem?

The related problem is that there is currently no facility by which to change the IMAP listener greeting, even though such a facility exists for SMTP listeners.

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