Add a ThreadPool which respects the order of Parquet dataset pieces.#796

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wbeardall wants to merge 2 commits intouber:masterfrom wbeardall:master

+168-8

Commits on May 12, 2023

Added 'orderedthread' worker pool, integration with 'make_reader' and 'make_batch_reader' and test.
wbeardall
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Fixed issue where ventilation of a subset of pieces would cause deadlock.
wbeardall
committed