Create nextflow process to hmmpress marker hmms

[chasemc]

One thing I wanted to note is that currently this only works with docker as executor (ie not with conda only) because the MARKERS process requires hmmpress'ed files. @Sidduppal This also needs to be addressed in the installation documentation https://github.com/Sidduppal/Autometa/blob/documentation/docs/source/install.rst

Reference on why docker works and conda alone doesn't: https://github.com/KwanLab/Autometa/blob/50f7a60c329acfa9e705b4cf343dfdcc21ade0ec/Dockerfile#L36-L41

Originally posted by @chasemc in https://github.com/KwanLab/Autometa/pull/157#issuecomment-838836484