Add async version of wait, add run and asyncRun #905

Job	Run time
macOS	3m 54s
linux (swift:5.7)	21m 42s
linux (swift:5.8)	21m 42s
linux (swift:5.9)	21m 43s
linux (swiftlang/swift:nightly-5.10-jammy)	21m 42s
	1h 30m 43s

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