implemented readgroup addition in fastq_align_chromap, since chromap has no option to do it

[Kevin-Brockers]

PR checklist

Closes #XXX

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[JoseEspinosa]

Just a small question but otherwise LGTM!

[JoseEspinosa]

Ah, I see this is done in #523 I guess

[JoseEspinosa]

Thanks! LGTM 🚀