feat(server): implement Clone for GracefulShutdown #436

Job	Run time
semver	15s
Check Style	7s
Test with Miri	49s
Check MSRV (1.63)	1m 56s
Test stable on ubuntu-latest	32s
features	44s
Test stable on windows-latest	1m 29s
Test stable on macos-latest	34s
Test beta on ubuntu-latest	35s
Test beta on windows-latest	1m 11s
Test beta on macos-latest	35s
Test nightly on ubuntu-latest	32s
Test nightly on windows-latest	1m 17s
Test nightly on macos-latest	56s
Build docs	14s
CI is green	1s
	11m 47s

Provide feedback