refactor(lib): remove lint config to allow unused code #2435

Job	Run time
semver	20s
Verify hyper.h is up to date	33s
Check Style	7s
Test C API (FFI)	41s
Test with Miri	37s
features	30s
minimal-versions	40s
Check MSRV	1m 29s
udeps	33s
Test stable on ubuntu-latest	1m 28s
Test stable on windows-latest	2m 40s
Test stable on macOS-latest	1m 58s
Test beta on ubuntu-latest	1m 23s
Test beta on windows-latest	2m 15s
Test beta on macOS-latest	1m 59s
Test nightly on ubuntu-latest	1m 16s
Test nightly on windows-latest	2m 15s
Test nightly on macOS-latest	2m 50s
Build docs	19s
Check exposed types	34s
CI is green	0s
	24m 27s

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