arrow

ARROW-13781: [Python] Allow per column encoding in parquet writer

This PR adds a new parameter to `write_table` to allow parquet encodings to be defined on a per column basis. The encodings currently supported are: PLAIN, BIT_PACKED, RLE, BYTE_STREAM_SPLIT, DELTA_BINARY_PACKED, DELTA_BYTE_ARRAY    .

It is not possible to set PLAIN_DICTIONARY and RLE_DICTIONARY for fallback encoding (those options will already be used by default in the C++ Parquet library).

Closes #11724 from AlenkaF/ARROW-13781

Authored-by: Alenka Frim <frim.alenka@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>