Add binary classification task IDs

[lewtun]

As a precursor to aligning the task IDs in datasets and AutoTrain, we need a way to distinguish binary vs multiclass vs multilabel classification.

This PR adds binary classification to the task IDs to enable this.

Related AutoTrain issue: https://github.com/huggingface/autonlp-backend/issues/597

cc @abhishekkrthakur @SBrandeis

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[lewtun]

Awesome thanks ! Can you add it to https://github.com/huggingface/hub-docs/blob/main/js/src/lib/interfaces/Types.ts first please ? This is where we define the cross libraries tasks taxonomy ;)

Thanks for the tip! Done in https://github.com/huggingface/hub-docs/pull/217

[lhoestq]

I don't think we need to update this file anymore. We should remove it IMO, and simply update the dataset tagging app

[albertvillanova]

I'm closing this PR.