SyncSM03: implement state transition logic

Implement performTransitions which does state transitions.
1. Determine the common ancestor state of current/destination states
2. Invoke state exit list from current state to common ancestor state.
3. Invoke state enter list from common ancestor state to destState by
going through mEnterStateStack.

The state transition is always defined so that the target can never be
changed mid-way of a state transition. In other words, calling
transitionTo in State enter and exit is not allowed.

Test: atest SyncStateMachineTest
Change-Id: I51e8c5440a8b9ac25715c3d030717421f68c15b3