refactor: add SSE Builder::on_response hook #2892

Job	Run time
contract-tests-curl	2m 27s
build-test	6m 32s
build-test-client-mac-curl	1m 47s
build-test-client-mac	5m 31s
build-test-client-windows-curl	10m 28s
build-test-client-windows	15m 8s
contract-tests	3m 23s
build-test-curl	2m 25s
	47m 41s

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