Add MMseqs

[olgabot]

Description of feature

https://nf-co.re/modules/mmseqs_search/ (already an nf-core module!)

[BlueBicycleBlog]

Satisfied by pull request : #44

[olgabot]

Keeping this open since we still need to add the Nextflow plumbing to run mTM-align in the subworkflow/functional_annotation/main.nf file