Implement IoSafe for the child process stdio types #651

Job	Run time
fmt	9s
clippy	29s
msrv (ubuntu-latest, 1.63)	1m 28s
cross (ubuntu-latest)	2m 27s
msrv (windows-latest, 1.63)	2m 3s
security_audit	10s
cross (macos-latest)	35s
test (ubuntu-latest, nightly)	1m 35s
windows_gnu (nightly, x86_64-pc-windows-gnu)	32s
test (ubuntu-latest, beta)	1m 12s
test (ubuntu-latest, stable)	1m 12s
test (windows-latest, nightly)	2m 17s
test (windows-latest, beta)	2m 6s
test (windows-latest, stable)	2m 46s
test (macos-latest, nightly)	1m 16s
test (macos-latest, beta)	1m 56s
test (macos-latest, stable)	2m 29s
	24m 42s

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