refactor: add Apply method to MemoryStore for transactional change se… #1741

Job	Run time
build-test-server-windows	17m 7s
contract-tests	4m 13s
build-test-server-mac	5m 49s
build-test-server-windows-curl	18m 14s
build-test-server-curl	7m 48s
build-test-server-mac-curl	7m 23s
contract-tests-curl	4m 27s
build-test-server	7m 34s
	1h 12m 35s

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