refactor(lib): remove lint config to allow unused code #2437

Job	Run time
Check Style	14s
semver	22s
Verify hyper.h is up to date	26s
features	25s
Test with Miri	45s
minimal-versions	36s
Test C API (FFI)	25s
Check MSRV	27s
Test stable on ubuntu-latest	1m 8s
udeps	23s
Test stable on windows-latest	2m 20s
Test stable on macOS-latest	2m 8s
Test beta on ubuntu-latest	1m 9s
Test beta on windows-latest	1m 46s
Test beta on macOS-latest	1m 35s
Test nightly on ubuntu-latest	1m 18s
Test nightly on windows-latest	1m 59s
Test nightly on macOS-latest	2m 15s
Build docs	13s
Check exposed types	16s
CI is green	1s
	20m 11s

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