Add binary classification task IDs
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_4584). All of your documentation changes will be reflected on that endpoint. > 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 I don't think we need to update this file anymore. We should remove it IMO, and simply update the dataset [tagging app](https://huggingface.co/spaces/huggingface/datasets-tagging) I'm closing this PR.
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 
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