Add bio.tools identifiers in meta.yml

[ewels]

The majority of bioinformatics tools that we use in this repo are listed in the https://bio.tools/ tool registry.

Each tool there has a unique identifier. It would be good to reference this identifier in the module meta.yml file.

Once we have this, we can look up additional information about the tool from the https://bio.tools/ API.

BioConda already references the https://bio.tools/ identifier in most cases. I'm not sure if it's possible to get this info automatically with our BioConda integration or not. If not we should use the BioTools API to fetch it in nf-core/tools.