Expose waitable handles in Windows #684

Job	Run time
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 21s
test (ubuntu-latest, nightly)	44s
fmt	5s
test (ubuntu-latest, beta)	41s
cross (ubuntu-latest)	1m 36s
msrv (ubuntu-latest, 1.63)	1m 21s
test (ubuntu-latest, stable)	36s
cross (macos-latest)	1m 20s
test (windows-latest, nightly)	1m 30s
security_audit	8s
msrv (windows-latest, 1.63)	1m 53s
test (windows-latest, beta)	1m 22s
test (windows-latest, stable)	2m 18s
clippy	17s
test (macos-latest, nightly)	1m 49s
test (macos-latest, beta)	1m 3s
test (macos-latest, stable)	1m 1s
	19m 5s

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