refactor: add Apply method to MemoryStore for transactional change sets #2724

Job	Run time
build-test-client-mac	3m 24s
contract-tests	3m 18s
contract-tests-curl	3m 25s
build-test-client-mac-curl	3m 25s
build-test-client-windows-curl	16m 15s
build-test-curl	6m 14s
build-test-client-windows	16m 5s
build-test	6m 7s
	58m 13s

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