Add support for abstract sockets #695

Job	Run time
msrv (ubuntu-latest, 1.63)	26s
msrv (windows-latest, 1.63)	1m 1s
clippy	19s
cross (ubuntu-latest)	1m 51s
test (ubuntu-latest, nightly)	46s
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 49s
cross (macos-latest)	23s
test (ubuntu-latest, beta)	41s
test (ubuntu-latest, stable)	39s
security_audit	7s
fmt	9s
test (windows-latest, nightly)	1m 40s
test (windows-latest, beta)	1m 29s
test (windows-latest, stable)	2m 32s
test (macos-latest, nightly)	1m 6s
test (macos-latest, beta)	1m 23s
test (macos-latest, stable)	1m 22s
	17m 43s

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