Make use of faster preset and multithreaded minimap2

[Ge0rges]

Switched to using the new version of minimap2 which has the new LrHq preset and multithreading.

Make use of that 4x faster preset.
Implement multithreading (I think it works?) for #18

[wdecoster]

Thank you @Ge0rges! Looks mostly okay, but the automated test reported two errors. Could you take a look at it? If necessary, I can help :)

[Ge0rges]

Checking it out right now

[Ge0rges]

@wdecoster should work now, I forgot to update the test functions.

[wdecoster]

Looks good! At some point, we should probably deal with the warning here:
https://github.com/wdecoster/chopper/actions/runs/8317985884/job/22759454860?pr=26#step:4:128

[Ge0rges]

Yeah I wasn't sure what that was about so I decided to leave it be for now.

[Ge0rges]

It might be worth mentioning somewhere that we use LrHq in case someone is still using older chemistry.

[Ge0rges]

@wdecoster do you think the PR merits a version bump and package?

[wdecoster]

Yes, I need to make a new release. Hmm, the older chemistry won't immediately go away. I am not yet sure what the best solution is.