CISA KEV Integration

[nicpenning]

Nessus does provide the CISA KEV information in Nessus scan data but it needs to be researched on how well that works and if it is usable in its rawest state.

Another option is to correlate or enrich data with the native CISA KEV database. This PR with Elastic Agent might be a viable way to do that: elastic/integrations#9240