Add blocking methods on `Client` #389

Job	Run time
sync	1m 2s
build (ubuntu-latest, 1.63.0)	3m 34s
build (ubuntu-latest, stable)	1m 55s
build (ubuntu-latest, beta)	2m 1s
build (ubuntu-latest, nightly)	1m 57s
build (macos-latest, 1.63.0)	3m 33s
build (macos-latest, stable)	1m 22s
build (macos-latest, beta)	1m 25s
build (macos-latest, nightly)	2m 12s
build (windows-latest, 1.63.0)	4m 48s
build (windows-latest, stable)	2m 56s
build (windows-latest, beta)	2m 54s
build (windows-latest, nightly)	3m 32s
	33m 11s

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