refactor: implement fdv2 polling initializer / synchronizer #2787

Job	Run time
build-test-curl	6m 44s
build-test-client-mac-curl	3m 14s
build-test-client-windows-curl	49m 5s
contract-tests-curl	3m 22s
build-test-client-windows	44m 16s
build-test-client-mac	3m 14s
contract-tests	3m 25s
build-test	6m 9s
	1h 59m 29s

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