Incorporate selectors into Shuttle#94

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FinnitoProductions wants to merge 15 commits intoawslabs:mainfrom FinnitoProductions:finn/selectors

+669-50

Commits on Jan 24, 2023

Get simple selector working, but with slight interface change (mutable receivers) and no Debug enforcement
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Make code compile with stricter linting added back
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Remove unnecessarily strict mutability constraint
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Add test that unused channels remain functional
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Add yield point within selector
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Simplify internal representation of selector
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Modify interface to align with crossbeam
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Consolidate selector logic into single mpsc module
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Create additional stubs to conform to crossbeam
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Commits on Jan 31, 2023

Prevent handles from being added multiple times to receiving queues
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