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David LiBenjamin Kietzman
2fab404d320
David Li authored and Benjamin Kietzman committed 7d233cb395c
ARROW-8631: [C++][Python][Dataset] Add ReadOptions to CsvFileFormat, expose options to python

This adds ReadOptions to CsvFileFormat and exposes ReadOptions, ConvertOptions, and CsvFragmentScanOptions to Python.

ReadOptions was added to CsvFileFormat as its options can affect the discovered schema. For the block size, which does not need to be global, a field was added to CsvFragmentScanOptions.

Closes #9725 from lidavidm/arrow-8631

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>