JsonRpcMessage.Converter.Read optimization #663

Job	Run time
build (ubuntu-latest, Debug)	3m 31s
build (windows-latest, Debug)	12m 41s
build (ubuntu-latest, Release)	3m 56s
build (macos-latest, Debug)	2m 39s
build (macos-latest, Release)	2m 12s
build (windows-latest, Release)	4m 49s
publish-coverage	0s
	29m 48s

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