Add benchmark vs `arrow::read/write_parquet`

[xiaodaigh]

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The new arrow package is now online, so can add arrow::read/write_parquet/arrow. I don't mind contributing to this but I will need to finish off a couple of CRAN submissions.

[MarcusKlik]

Hi @xiaodaigh, thanks for your request!

Indeed, we should create some extensive benchmarks to compare arrow and fst. Perhaps we could take the benchmark code from #177 (posted [here])(https://gist.github.com/fstpackage/e710cf2adaa02f96bc8dbee9318ba733) as a start as it compares the performance for various types, number of rows and threads.

Your contribution would be much appreciated!

[MarcusKlik]

I've posted some initial benchmarks here and more detailed measurements are forthcoming in this repo.