Fix flatten of Sequence feature type
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2022-03-18T11:35:49Z
https://github.com/huggingface/datasets/pull/3962#issuecomment-1072327345
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2022-03-21T14:40:47Z
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The `Sequence` features type is not correctly flattened if it contains a dictionary. This PR fixes this, and I added a test case for this.

Close https://github.com/huggingface/datasets/issues/3795