feat: Add tracing hook. #1574

Job	Run time
contract-tests	3m 37s
contract-tests-curl	3m 38s
build-test-server-curl	6m 51s
build-test-server-windows	19m 31s
build-test-server	6m 41s
build-test-server-mac	7m 46s
build-test-server-windows-curl	21m 5s
build-test-server-mac-curl	9m 13s
	1h 18m 22s

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