Add missing Suricata schema types and fields

[satta]

📔 Description

This PR introduces the currently missing Suricata schema types nfs, tftp, snmp and ikev2. It also adds correct and consistent types for the common fields vlan and in_iface.

📝 Checklist

• All user-facing changes have changelog entries. (n/a)
• The changes are reflected on docs.tenzir.com/vast, if necessary. (no dedicated Suricata schema documentation there yet)
• The PR description contains instructions for the reviewer, if necessary. (see below)

🎯 Review Instructions

Please double-check whether the changes correspond to current best practices and whether the schema loads for the relevant VAST versions.

[mavam]

Thanks for contributing these definitions!

Since you changed the layout, the integration test baseline needs to be updated. (This is why CI fails.) If you invoke make integration in the build directory, you'll see the diff to the baseline. If this looks reasonable, you can invoke ./integration_BUILD_TYPE.sh -u where -u stands for "update baseline."

Thereafter, CI will be green.

[satta]

Thanks for the explanation, will do.

It's OK to introduce optional fields where the output might be 'null', right? I did this because, for example, vlan and pcap_cnt was defined only in some types, while in fact they are common to all types, just only present when the traffic has VLAN tags and/or was replayed from pcaps.

[mavam]

It's OK to introduce optional fields where the output might be 'null', right?

Yes, that works. In fact, that's currently how we can have non-breaking updates. The new type can technically be seen as a strict superset of the old type.

[mavam]

Nice work! 🙏