Add suricata.rfb schema type

[satta]

📔 Description

Add a new schema record type for Suricata's rfb event type.

📝 Checklist

• All user-facing changes have changelog entries.
• The changes are reflected on docs.tenzir.com/vast, if necessary.
• The PR description contains instructions for the reviewer, if necessary.

🎯 Review Instructions

There should not be any required updates to the reference files, at least build/vast/integration_RelWithDebInfo.sh -u did not change anything in the repo. Please double-check if that's the case.