Implement IoSafe for the child process stdio types #652

Job	Run time
clippy	29s
cross (ubuntu-latest)	2m 33s
msrv (ubuntu-latest, 1.63)	1m 25s
fmt	10s
cross (macos-latest)	50s
msrv (windows-latest, 1.63)	2m 5s
security_audit	8s
windows_gnu (nightly, x86_64-pc-windows-gnu)	2m 3s
test (ubuntu-latest, nightly)	1m 17s
test (ubuntu-latest, beta)	1m 20s
test (ubuntu-latest, stable)	1m 10s
test (windows-latest, nightly)	2m 8s
test (windows-latest, beta)	1m 54s
test (windows-latest, stable)	2m 9s
test (macos-latest, nightly)	1m 52s
test (macos-latest, beta)	2m 0s
test (macos-latest, stable)	57s
	24m 30s

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