Datamaestro integration

**Is your feature request related to a problem? Please describe.**

Integration within datamaestro

**Describe the solution you'd like**

I am working on integrating `ir-datasets` into [datamestro](https://github.com/experimaestro/datamaestro) so that querying available datasets is more standardized (JSON generation, etc.), which in turns provides a way to automate indexing and retrieval (see e.g. [retrieval with experimaestro-ir](https://experimaestro-ir.readthedocs.io/en/latest/)).

It would also allow to consider dataset management within ir-datasets (cleanup, [documentation](https://datamaestro-text.readthedocs.io/en/latest/datamaestro/df/text/com.microsoft.msmarco.passage.html) and maybe more when `datamaestro` matures)

**Describe alternatives you've considered**

None

**Additional context**

At the moment, I am coding within [experimaestro-ir](https://experimaestro-ir.readthedocs.io/en/latest/) but would be glad to move the code to irds and modifying `datamaestro` so that it is more generic (abstracting away dataset access). If moving to `ir_datasets`, the code will be isolated so that it only is triggered when datamaestro is installed and used.