ARROW-14192: [C++][Dataset] Backpressure broken on ordered scans#11294

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westonpace wants to merge 6 commits intoapache:masterfrom

westonpace:feature/ARROW-14192--backpressure-ordered-scan

Commits on Oct 18, 2021

ARROW-14192: Added a merge generator that will still allow some file readahead but won't allow backpressure to explode if scanning in a sequenced fashion.
westonpace
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ARROW-14192: Lint and added a python test
westonpace
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ARROW-14192: Fixing test issue introduced by rebase
westonpace
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ARROW-14192: Added the C++ ordered backpressure scanning test back in
westonpace
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ARROW-14192: Added a comment to MakeAutoStartingGenerator. Cleaned up some grammar in async_generator.h comments. Removed timing-dependent backpressure test to avoid having too many timing depend…
westonpace
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ARROW-14192: Update cpp/src/arrow/util/async_generator.h

westonpace
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lidavidm
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