feat(server): add h1 `idle_timeout` #2820

Job	Run time
semver	14s
Check Style	5s
Verify hyper.h is up to date	16s
Test with Miri	2m 12s
Check MSRV	4m 3s
Test C API (FFI)	26s
features	15s
minimal-versions	23s
Test stable on ubuntu-latest	1m 16s
udeps	22s
Test stable on windows-latest	2m 20s
Test stable on macOS-latest	1m 6s
Test beta on ubuntu-latest	1m 21s
Test beta on windows-latest	1m 58s
Test beta on macOS-latest	1m 13s
Test nightly on ubuntu-latest	1m 22s
Test nightly on windows-latest	2m 20s
Test nightly on macOS-latest	1m 23s
Check exposed types	20s
Build docs	21s
CI is green	0s
	23m 16s

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