feat(lib): missing Timer will warn or panic #2314

Job	Run time
Verify hyper.h is up to date	24s
Check Style	6s
Test with Miri	1m 49s
features	22s
Check MSRV	2m 41s
Test C API (FFI)	1m 10s
udeps	37s
Test stable on ubuntu-latest	1m 58s
Test stable on windows-latest	2m 50s
Test stable on macOS-latest	2m 40s
Test beta on ubuntu-latest	2m 25s
Test beta on windows-latest	2m 30s
Test beta on macOS-latest	3m 39s
Test nightly on ubuntu-latest	1m 45s
Test nightly on windows-latest	2m 46s
Test nightly on macOS-latest	3m 13s
Build docs	36s
Check exposed types	37s
CI is green	3s
	32m 11s

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