refactor: split json parsing/translation for future-proofing client/server distinction #2800

Job	Run time
build-test-curl	6m 18s
build-test-client-windows-curl	15m 1s
build-test-client-mac	8m 4s
build-test-client-windows	15m 32s
contract-tests	3m 23s
contract-tests-curl	3m 23s
build-test	6m 0s
build-test-client-mac-curl	4m 59s
	1h 2m 40s

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