[QST] Compressed tsv data support in nvt.dataset

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@benfred is already working on this.

Since Jun 22, 2020.

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Simple question. Does nvt.dataset support compressed tsv file? Like day_0.gz in Criteo dataset used in the example... Must we decompress it in advance?

Right now, at the following line, UnicodeDecodeError happens because NVTabular tries to open given file as a text file although the file is gzip compressed...
https://github.com/NVIDIA/NVTabular/blob/master/nvtabular/io.py#L182

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