Initial public draft of custom executors proposal.#2654

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al45tair wants to merge 3 commits intoswiftlang:mainfrom al45tair:custom-executors

+667

Commits on Dec 9, 2024

Initial public draft of custom executors proposal.
al45tair
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Commits on Jan 20, 2025

Updates following pitch comments.
al45tair
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Commits on Jan 21, 2025

Add ExecutorJob.allocator and move allocation methods there.
al45tair
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