Introduce hyper::ext::Http1RawMessage #2354

Job	Run time
Check Style	9s
Verify hyper.h is up to date	18s
features	48s
Test with Miri	1m 21s
Test C API (FFI)	47s
Check deprecated on stable	25s
Check MSRV (1.63)	1m 2s
Check deprecated on beta	28s
Test stable on ubuntu-latest	1m 45s
Test stable on windows-latest	3m 44s
Test stable on macOS-latest	4m 7s
Test beta on ubuntu-latest	1m 45s
Test beta on windows-latest	2m 47s
Test beta on macOS-latest	3m 58s
Test nightly on ubuntu-latest	1m 48s
Test nightly on windows-latest	3m 16s
Test nightly on macOS-latest	2m 43s
Build docs	22s
CI is green	0s
	31m 33s

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