feat: Add support for CURL networking. #2502

Job	Run time
build-test	5m 46s
contract-tests	2m 51s
contract-tests-curl	5m 10s
build-test-curl	5m 38s
build-test-client-mac-curl	5m 48s
build-test-client-mac	11m 31s
build-test-client-windows	16m 0s
build-test-client-windows-curl	16m 41s
	1h 9m 25s

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