Decompose hyper::Client into utils (part 1) #118

Job	Run time
Check Style	18s
Test with Miri	50s
Check MSRV (1.56)	2m 56s
features	31s
Test stable on ubuntu-latest	35s
Test stable on windows-latest	1m 23s
Test stable on macOS-latest	55s
Test beta on ubuntu-latest	36s
Test beta on windows-latest	1m 17s
Test beta on macOS-latest	52s
Test nightly on ubuntu-latest	35s
Test nightly on windows-latest	1m 5s
Test nightly on macOS-latest	47s
Build docs	24s
CI is green	0s
	13m 4s

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