Suricata

With the development of the IMAP parser, the code in src/output-json-email-common.c could be reused to log emails from IMAP.
However, it is currently tightly coupled to the SMTP implementation.

Since we plan to rewrite the SMTP code in Rust, Victor and I agreed during the team meeting that this code should be refactored once the IMAP parser is merged.

For now, this issue is blocked by #8276