Rename MerkleStateLifecycle

[imalygin]

As #16568 suggests, the platform should not depend on the implementation of the state. And the fact that State is a Merkle tree is that implementation detail. It should removed from the class name. However, the name StateLifecycle would be confusing as well, as the state lifecycle denotes a different thing. Specifically, it can be represented by this diagram:

In this case we're dealing with SwirldsState lifecycle. That's, a platform perspective of the state. So, the better name for the interface should be SwirldsStateLifecycle