Remove unused legacy Beam utils
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2022-04-04T14:55:13Z
https://github.com/huggingface/datasets/pull/4088#issuecomment-1087660951
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2022-04-05T15:23:26Z
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This PR removes unused legacy custom `WriteToParquet`, once official Apache Beam includes the patch since version 2.22.0: 
- Patch PR: https://github.com/apache/beam/pull/11699
- Issue: https://issues.apache.org/jira/browse/BEAM-10022

In relation with:
- #204