refactor(common): remove unused H2Stream stub (#3351) #2217

Job	Run time
Verify hyper.h is up to date	39s
Check Style	9s
features	23s
Test with Miri	1m 27s
Check MSRV	40s
Test C API (FFI)	30s
udeps	34s
Test stable on ubuntu-latest	1m 35s
Test stable on windows-latest	4m 36s
Test stable on macOS-latest	2m 51s
Test beta on ubuntu-latest	1m 48s
Test beta on windows-latest	3m 8s
Test beta on macOS-latest	2m 27s
Test nightly on ubuntu-latest	2m 13s
Test nightly on windows-latest	4m 54s
Test nightly on macOS-latest	3m 2s
Check exposed types	32s
Build docs	32s
CI is green	1s
	32m 1s

Provide feedback