refactor: add SSE Builder::on_response hook #1902

Job	Run time
contract-tests-curl	4m 40s
contract-tests	4m 23s
build-test-server-mac	6m 10s
build-test-server-windows	21m 25s
build-test-server	8m 21s
build-test-server-mac-curl	6m 2s
build-test-server-curl	6m 23s
build-test-server-windows-curl	18m 10s
	1h 15m 34s

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