feat: Add support for CURL networking. #2501

Job	Run time
contract-tests	2m 44s
contract-tests-curl	5m 2s
build-test	5m 43s
build-test-client-mac-curl	9m 8s
build-test-client-mac	6m 15s
build-test-client-windows-curl	16m 30s
build-test-client-windows	16m 5s
build-test-curl	5m 11s
	1h 6m 38s

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