feat: Add support for CURL networking. #1548

Job	Run time
contract-tests-curl	4m 51s
contract-tests	3m 30s
build-test-server-curl	8m 16s
build-test-server	7m 1s
build-test-server-windows	17m 37s
build-test-server-mac-curl	12m 17s
build-test-server-mac	13m 37s
build-test-server-windows-curl	20m 23s
	1h 27m 32s

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