refactor: implement fdv2 polling initializer / synchronizer #2741

Job	Run time
build-test-client-mac-curl	4m 21s
contract-tests-curl	3m 34s
build-test-client-mac	5m 8s
build-test-curl	6m 31s
build-test	6m 4s
build-test-client-windows	15m 22s
contract-tests	3m 15s
build-test-client-windows-curl	15m 51s
	1h 0m 6s

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