ARROW-11843: [C++] Provide async Parquet reader#9620

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lidavidm wants to merge 8 commits intoapache:masterfrom

lidavidm:parquet-reentrant

Commits on Jun 7, 2021

ARROW-11843: [C++] Specialize Future<>::Future(Status)

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ARROW-11843: [C++] Provide reentrant Parquet reader

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ARROW-11843: [C++][Dataset] Implement ParquetFileFormat::ScanBatchesAsync

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ARROW-11843: [C++] Address review feedback

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ARROW-11843: [C++] Add test of OpenAsync with encryption

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ARROW-11843: [C++] Defer pre-buffer handling to reader

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ARROW-11843: [C++] Add missing #include

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Nits
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