add custom/splitfastqbylane module

[anoronh4]

PR checklist

Addresses #13

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the module conventions in the contribution docs
• If necessary, include test data in your PR.
• Remove all TODO statements.
• Emit the versions.yml file.
• Follow the naming conventions.
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• Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • nf-test test --profile=docker --tag
  • nf-test test --profile=singularity --tag
  • nf-test test --profile=conda --tag

[anoronh4]

i need to fix conda weirdness here but the logic of the process should be accurate.

[anoronh4]

conda issues have been fixed, everything seems to be passing tests now!

[buehlere]

Looks good! I made a few minor comments to consider, but I think this is good as is.

[buehlere]

Looks good to me!