feat: Add tracing hook. #2548

Job	Run time
contract-tests	44s
contract-tests-curl	52s
build-test-client-mac	1m 17s
build-test-client-windows	6m 31s
build-test-client-mac-curl	1m 19s
build-test-curl	2m 12s
build-test	39s
build-test-client-windows-curl	7m 6s
	20m 40s

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