Specify the feature types of a dataset on the Hub without needing a dataset script
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After looking into this, discovered that this is already supported if the `dataset_infos.json` file is configured correctly! Here is a working example: https://huggingface.co/datasets/abidlabs/test-audio-13

This should be probably be documented, though. 
**Is your feature request related to a problem? Please describe.**
Currently if I upload a CSV with paths to audio files, the column type is string instead of Audio.

**Describe the solution you'd like**
I'd like to be able to specify the types of the column, so that when loading the dataset I directly get the features types I want.

The feature types could read from the `dataset_infos.json` for example.

**Describe alternatives you've considered**
Create a dataset script to specify the features, but that seems complicated for a simple thing.

cc @abidlabs 
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