feat(server): implement Clone for GracefulShutdown #430

Job	Run time
semver	20s
Check Style	11s
features	49s
Test with Miri	50s
Check MSRV (1.63)	1m 52s
Test stable on ubuntu-latest	30s
Test stable on windows-latest	3m 54s
Test stable on macos-latest	30s
Test beta on ubuntu-latest	36s
Test beta on windows-latest	1m 35s
Test beta on macos-latest	37s
Test nightly on ubuntu-latest	34s
Test nightly on windows-latest	1m 29s
Test nightly on macos-latest	37s
Build docs	14s
CI is green	1s
	14m 39s

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