Fix metadata validation
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2022-05-23T09:34:33Z
https://github.com/huggingface/datasets/pull/4390#issuecomment-1134427959
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2022-06-01T09:27:52Z
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Since Python 3.8, the typing module:
- raises an AttributeError when trying to access `__args__` on any type, e.g.: `List.__args__`
- provides the `get_args` function instead: `get_args(List)`

This PR implements a fix for Python >=3.8 whereas maintaining backward compatibility.