feat: parsnp module

[emmcauley]

PR checklist

Closes #8614.

This PR adds a new parsnp module and tests. The test is a bit contrived because I'm using the same FASTA files but I think it is sufficient -- I can also add some more complex test cases if preferred.

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[akaviaLab]

In general, looks good to me, but I have some comments. I'd suggest getting one of the core maintainers to look at it.

[famosab]

Thank you for your contribution to nf-core! I added a few comments to your PR. :)

[akaviaLab]

I think you're not supposed to gave ontologies in the meta parts of a tuple. AFAIK, the groovy maps don't need it. Apart from that, looks good to me!

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