Create SimulatedStateHasher for TurtleTests

[IvanKavaldzhiev]

One of the ways to validate proper integration cases in TurtleTests will be to inspect the state that is hashed during a transaction workflow.

Create a SimulatedStateHasher component that implements StateHasher, so that we can collect the hashed version of a state after a given transaction has been applied to the state, so that we check the correctness of the state and the hashing itself.