nf-test component for 'Nextflow for Genomics'

[pinin4fjords]

To be merged after #534 (and re-pointed to master as base):

This is a port of (most of) the content formerly known as 'Hello nf-test'. Changes:

• Stripped content now covered in the nf-test side-quest
• Removed unnecessary nf-core references (e.g. the use of /local in module paths)
• Added more specific commentary for genomics processes
• Be more opinionated on setup usage.
• Use actual workflow outputs to generate test data

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[adamrtalbot]

Nice, I think this module needs some refinement in the context of the new module but it's good enough for now

The base branch was changed.