Feature flags: `server-auto` should imply `server` #193

Job	Run time
Check Style	12s
Test with Miri	39s
Check MSRV (1.63)	3m 55s
features	40s
Test stable on ubuntu-latest	24s
Test stable on windows-latest	58s
Test stable on macOS-latest	57s
Test beta on ubuntu-latest	25s
Test beta on windows-latest	52s
Test beta on macOS-latest	1m 7s
Test nightly on ubuntu-latest	23s
Test nightly on windows-latest	42s
Test nightly on macOS-latest	52s
Build docs	21s
CI is green	1s
	12m 28s

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