Improve performance for VCFAnnotator

[korikuzma]

Parallelize? If we want people to use the tool, we have to improve the performance

[wesleygoar]

I do think we should parallelize. I think that would be an easy win.

[wesleygoar]

I think we should def investigate ways to improve single threaded performance as well.

[korikuzma]

I can take a stab at it since people really want this.

[korikuzma]

Goal: 10k/s

[github-actions]

This issue was marked stale due to inactivity.