refactor: implement fdv2 polling initializer / synchronizer #2750

Job	Run time
contract-tests-curl	3m 32s
build-test-client-mac	4m 27s
build-test-client-windows	14m 15s
contract-tests	3m 22s
build-test-client-mac-curl	3m 38s
build-test	5m 55s
build-test-curl	6m 12s
build-test-client-windows-curl	15m 53s
	57m 14s

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