[Feature] Alternatives to Hyperscan, now that's Intel customers only

[Glandos]

Summary

Hyperscan is now proprietary, and only available for Intel customers: https://www.phoronix.com/news/Intel-Hyperscan-Now-Proprietary

Motivation

Hyperscan fits really good for rspamd, with many regex on a small content. It's a very nice to have

Describe alternatives you've considered

It seems that there's a fork at https://github.com/VectorCamp/vectorscan
It's good not to rush on it and wait a bit, but it's something that seems to be a valid alternative.

Additional context

None

[vstakhov]

Rspamd works with vectorscan without any changes OOB.