Introduce bioconductor lister

The way this lister works is that it scrapes origins from pages like:

• https://bioconductor.org/packages/json/3.17/bioc/packages.json
• https://bioconductor.org/packages/json/3.17/workflows/packages.json
• https://bioconductor.org/packages/json/3.18/bioc/packages.json

Note the pattern https://bioconductor.org/packages/json/<release-version>/<category>/packages.json

Here, I've coined the term "category" to represent the 4 possible values: bioc, workflows, data/annotation, and data/experiment.

This packages.json file is a dictionary of all the packages. We iterate through them and send them to the scheduler.

Related to #4699

Refs. swh/meta#5051