Add R csv benchmarks

[jonkeane]

Arrow bench has a read_csv benchmark that would be nice to have.

These are the arguments (the defaults from are {arrowbench} are ~what we want to run, though I'm happy to adjust them if we decide that only a subset of sources should be default)

• It supports all of the arrowbench sources (though we don't need to run all of them, the first three are probably most important) as the source argument:
  • fanniemae_2016Q4
  • nyctaxi_2010-01
  • chi_traffic_2020_Q1
  • type_strings
  • type_dict
  • type_integers
  • type_floats
  • type_nested
  • type_simple_features
• It supports uncompressed and gzip compressed files as the compression argument
• It supports output formats arrow_table and data_frame as the output argument
• The reader argument should be arrow (the other readers it knows how to test are not important for and should not be run on conbench)