Add support for visionOS #779

Job	Run time
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 21s
cross (ubuntu-latest)	1m 38s
cross (macos-latest)	1m 10s
fmt	7s
clippy	33s
msrv (ubuntu-latest)	1m 40s
security_audit	6s
msrv (windows-latest)	2m 21s
test (ubuntu-latest, nightly)	39s
test (ubuntu-latest, beta)	38s
test (ubuntu-latest, stable)	32s
test (windows-latest, nightly)	1m 20s
test (windows-latest, beta)	1m 9s
test (windows-latest, stable)	1m 38s
test (macos-latest, nightly)	47s
test (macos-latest, beta)	43s
test (macos-latest, stable)	41s
	17m 3s

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