[issue33533] Provide an async-generator version of as_completed

[Justin Arthur]

Change by Justin Arthur <justinarthur at gmail.com>:


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nosy: +JustinTArthur
nosy_count: 5.0 -> 6.0
pull_requests: +21508
pull_request: https://github.com/python/cpython/pull/22491

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33533>
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