ci: Add sccache compiler cache #3059

Job	Run time
build-test-client-windows	13m 7s
contract-tests-curl	3m 48s
build-test	5m 54s
build-test-curl	6m 42s
build-test-client-mac	3m 52s
build-test-client-mac-curl	4m 24s
build-test-client-windows-curl	14m 57s
contract-tests	3m 26s
	56m 10s

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