make it easy to discover and load datasets

[CarloLucibello]

We could provide some convenience functions like list_datasets() and `load_dataset("mnist").

[lorenzoh]

Have you seen https://github.com/lorenzoh/FeatureRegistries.jl? In FastAI.jl, it's used to create such a list, make it easier to search for datasets and handle the downloading: https://fluxml.ai/FastAI.jl/dev/references/FastAI.Registries.datasets

[johnnychen94]

Curiously, what's the relationship between FastAI.Datasets and MLDatasets -- are they going to duplicate each other, or will they be merged into one eventually?

[lorenzoh]

FastAI.jl will allow loading datasets from MLDatasets.jl. If MLDatasets.jl wants to include a feature registry for datasets, I'd also be happy to merge additional datasets currently in FastAI.jl into MLDatasets.jl (i.e. everything here: https://course.fast.ai/datasets)

[Dsantra92]

We should also consider adding license and citing information with each dataset/datahub.

[lorenzoh]

How about using FeatureRegistries.jl for this?