Add a new config to set TCP_USER_TIMEOUT #490

Job	Run time
semver	14s
Check Style	7s
features	36s
Check MSRV (1.63)	1m 0s
Test stable on ubuntu-latest	30s
Test stable on windows-latest	3m 47s
Test with Miri	47s
Test stable on macos-latest	32s
Test beta on ubuntu-latest	36s
Test beta on windows-latest	1m 18s
Test beta on macos-latest	41s
Test nightly on ubuntu-latest	35s
Test nightly on windows-latest	1m 25s
Test nightly on macos-latest	47s
Build docs	13s
CI is green	1s
	13m 9s

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