ARROW-7636: [Python] Clean-up the pyarrow.dataset.partitioning() API#6244

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jorisvandenbossche:ARROW-7636

Commits on Jan 21, 2020

split field_names in separate options for schema and field_names
jorisvandenbossche
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pass throug list of field names in source/dataset()
jorisvandenbossche
committed