feat(server): add h1 `idle_timeout` #2831

Job	Run time
Check Style	8s
semver	17s
Verify hyper.h is up to date	16s
minimal-versions	22s
features	36s
Test with Miri	2m 14s
Test C API (FFI)	31s
Check MSRV	4m 30s
Test stable on ubuntu-latest	1m 14s
udeps	25s
Test stable on windows-latest	2m 35s
Test stable on macOS-latest	1m 5s
Test beta on ubuntu-latest	1m 16s
Test beta on windows-latest	2m 8s
Test beta on macOS-latest	1m 14s
Test nightly on ubuntu-latest	1m 19s
Test nightly on windows-latest	2m 22s
Test nightly on macOS-latest	1m 23s
Check exposed types	13s
Build docs	23s
CI is green	1s
	24m 32s

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