Add API for poisoning connections #450

Job	Run time
Check Style	13s
semver	19s
Test with Miri	56s
Check MSRV (1.63)	2m 10s
features	50s
Test stable on ubuntu-latest	34s
Test stable on windows-latest	1m 30s
Test stable on macos-latest	30s
Test beta on ubuntu-latest	34s
Test beta on windows-latest	1m 8s
Test beta on macos-latest	44s
Test nightly on ubuntu-latest	33s
Test nightly on windows-latest	1m 22s
Test nightly on macos-latest	40s
Build docs	12s
CI is green	0s
	12m 15s

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