arrow

ARROW-15040: [R] Enable write_csv_arrow to take a Dataset or arrow_dplyr_query as input

Closes #11971 from thisisnic/ARROW-15040_rb_reader

Lead-authored-by: Nic Crane <thisisnic@gmail.com>
Co-authored-by: Nicola Crane <thisisnic@gmail.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>