feat: Add tracing hook. #1561

Job	Run time
contract-tests	3m 31s
contract-tests-curl	4m 26s
build-test-server-curl	6m 50s
build-test-server-windows	19m 55s
build-test-server-mac	12m 50s
build-test-server	7m 9s
build-test-server-mac-curl	10m 25s
build-test-server-windows-curl	20m 1s
	1h 25m 7s

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