Implement Dataset add_column
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#2274 has been merged. You can now merge master into this branch and use `assert_arrow_metadata_are_synced_with_dataset_features(dset)` to make sure that the metadata are good :)
2021-04-29T14:10:52Z
https://github.com/huggingface/datasets/pull/2145#issuecomment-829271107
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2021-04-29T14:10:52Z
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Implement `Dataset.add_column`.

Close #1954.