method to select columns
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duplicate of #2655
2021-12-07T02:45:27Z
https://github.com/huggingface/datasets/issues/3391#issuecomment-987516895
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2021-12-07T02:45:27Z
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**Is your feature request related to a problem? Please describe.**

* There is currently no way to select some columns of a dataset. In pandas, one can use `df[['col1', 'col2']]` to select columns, but in `datasets`, it results in error.

**Describe the solution you'd like**

* A new method that can be used to create a new dataset with only a list of specified columns.

**Describe alternatives you've considered**

`.remove_columns(self, columns: Union[str, List[str]], inverse: bool = False)`
Or 
`.select(self,  indices: Iterable = None, columns: List[str] = None)`



