feat: Add support for CURL networking. #1481

Job	Run time
contract-tests	3m 17s
contract-tests-curl	3m 57s
build-test-server-curl	6m 44s
build-test-server	6m 38s
build-test-server-windows	18m 19s
build-test-server-mac	1s
build-test-server-mac-curl	1s
build-test-server-windows-curl	19m 19s
build-test-server-mac	10m 48s
build-test-server-mac-curl	16m 23s
contract-tests	3m 17s
build-test-server	6m 38s
contract-tests-curl	3m 57s
build-test-server-windows	18m 19s
build-test-server-curl	6m 44s
build-test-server-windows-curl	19m 19s
	2h 23m 41s

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