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ARROW-10485: [R] Accept partitioning in open_dataset when file paths are hive-style

Also fixes ARROW-14743

Closes #12133 from nealrichardson/open-dataset-partition

Lead-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Co-authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>