ARROW-12208: [C++] Add the ability to run async tasks without using the CPU thread pool#9892

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Commits on Apr 9, 2021

ARROW-12208: Added a serial executor which can run async code serially without needing to create threads. In addition, modifies the Scanner::ToTable and FileSystemDataset::Write to execute seriall…
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ARROW-12208: Restoring unit tests accidentally removed with previous commit
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ARROW-12208: Restoring unit tests accidentally removed with previous commit
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ARROW-12208: Forgot to assign the lock guard appropriately.
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ARROW-12208: Addressed some of the PR feedback
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ARROW-12208: Forgot to export function
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ARROW-12208: Addressed PR comments
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* Simplify SerialExecutor a bit

pitrou
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ARROW-12208: Instead of calling task_group->Finish and then AllComplete(futures) I added task_group->FinishAsync to the futures and called AllComplete on that.
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