Add SubWorkflow: mmseqs_contig_taxonomy

[Darcy220606]

PR checklist

Purpose: This PR adds a subworkflow that combines multiple mmseqs tools. Function: This adds taxonomic classification to input 'nucleotide' sequences (e.g. contigs) , which can potentially be used in multiple pipelines, e.g. nf-core/funcscan and nf-core/taxprofiler.

• [x] This comment contains a description of changes (with reason).
• [ ] If you've fixed a bug or added code that should be tested, add tests!
• [x] 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.
• [x] Remove all TODO statements.
• [x] Emit the versions.yml file.
• [x] Follow the naming conventions.
• [ ] Follow the parameters requirements.
• [x] Follow the input/output options guidelines.
• [x] Add a resource label
• [ ] 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:
  • For modules:
    • [ ] nf-core modules test <MODULE> --profile docker
    • [ ] nf-core modules test <MODULE> --profile singularity
    • [ ] nf-core modules test <MODULE> --profile conda
  • For subworkflows:
    • [x] nf-core subworkflows test <SUBWORKFLOW> --profile docker
    • [x] nf-core subworkflows test <SUBWORKFLOW> --profile singularity
    • [x] nf-core subworkflows test <SUBWORKFLOW> --profile conda