feat: add auto Connection::into_owned #405

Job	Run time
Check Style	34s
semver	1m 1s
features	38s
Check MSRV (1.63)	52s
Test with Miri	1m 2s
Test stable on ubuntu-latest	40s
Test stable on windows-latest	2m 38s
Test stable on macos-latest	28s
Test beta on ubuntu-latest	37s
Test beta on windows-latest	1m 21s
Test beta on macos-latest	1m 36s
Test nightly on ubuntu-latest	42s
Test nightly on windows-latest	1m 20s
Test nightly on macos-latest	1m 13s
Build docs	14s
CI is green	1s
	14m 57s

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