feat: Add tracing hook. #2551

Job	Run time
contract-tests	2m 47s
contract-tests-curl	4m 31s
build-test-curl	5m 19s
build-test	5m 37s
build-test-client-mac	15m 12s
build-test-client-windows	16m 28s
build-test-client-windows-curl	15m 14s
build-test-client-mac-curl	10m 22s
	1h 15m 30s

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