Add support for abstract sockets #694

Job	Run time
clippy	15s
msrv (ubuntu-latest, 1.63)	26s
cross (ubuntu-latest)	1m 10s
msrv (windows-latest, 1.63)	1m 1s
fmt	3s
security_audit	7s
cross (macos-latest)	30s
test (ubuntu-latest, nightly)	44s
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 16s
test (ubuntu-latest, beta)	41s
test (ubuntu-latest, stable)	36s
test (windows-latest, nightly)	1m 32s
test (windows-latest, beta)	1m 15s
test (windows-latest, stable)	2m 28s
test (macos-latest, nightly)	2m 0s
test (macos-latest, beta)	57s
test (macos-latest, stable)	1m 14s
	16m 15s

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