ARROW-15871: [Python] Start raising deprecation warnings for ParquetDataset keywords that won't be supported with the new API#12585

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jorisvandenbossche:ARROW-15871

Commits on Mar 30, 2022

deprecate schema keyword+attribute for legacy ParquetDataset + expose it in the non-legacy read_table

jorisvandenbossche
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deprecate metadata_nthreads keyword

jorisvandenbossche
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pitrou
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keyword -> argument

jorisvandenbossche
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pitrou
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