feat(server): implement Clone for GracefulShutdown #443

Job	Run time
Check Style	12s
semver	5m 53s
features	48s
Test with Miri	46s
Check MSRV (1.63)	1m 58s
Test stable on ubuntu-latest	39s
Test stable on windows-latest	1m 14s
Test stable on macos-latest	34s
Test beta on ubuntu-latest	37s
Test beta on windows-latest	1m 10s
Test beta on macos-latest	33s
Test nightly on ubuntu-latest	35s
Test nightly on windows-latest	1m 27s
Test nightly on macos-latest	33s
Build docs	14s
CI is green	0s
	17m 13s

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