[Feature] Keep the list of labels of a dataset as metadata
This should be accessible now as a feature in dataset.info.features (and even have the mapping methods).
It would be useful to keep the list of the labels of a dataset as metadata. Either directly in the `DatasetInfo` or in the Arrow metadata.
[Feature] Keep the list of labels of a dataset as metadata 
 It would be useful to keep the list of the labels of a dataset as metadata. Either directly in the `DatasetInfo` or in the Arrow metadata. 
 This should be accessible now as a feature in dataset.info.features (and even have the mapping methods).