Change persistence model structure

- Fix wrong acquire logic in DefaultStatemachineService.
- Overhaul StateMachineRuntimePersister
- Change StateMachineRuntimePersister to extend
  StateMachinePersist which should work better on
  a bean level. Also add generic type T to it and
  config where needed.
- Relates to #432
- Relates to #427

spring-statemachine-data/jpa/src/test/java/org/springframework/statemachine/data/jpa/JpaRepositoryTests.java

@@ -363,7 +363,7 @@ public class JpaRepositoryTests extends AbstractRepositoryTests {
 		}
 
 		@Bean
-		public StateMachineRuntimePersister<String, String> stateMachineRuntimePersister() {
+		public StateMachineRuntimePersister<String, String, String> stateMachineRuntimePersister() {
 			return new JpaPersistingStateMachineInterceptor<>(jpaStateMachineRepository);
 		}
 	}
@@ -408,7 +408,7 @@ public class JpaRepositoryTests extends AbstractRepositoryTests {
 		}
 
 		@Bean
-		public StateMachineRuntimePersister<PersistTestStates, PersistTestEvents> stateMachineRuntimePersister() {
+		public StateMachineRuntimePersister<PersistTestStates, PersistTestEvents, String> stateMachineRuntimePersister() {
 			return new JpaPersistingStateMachineInterceptor<>(jpaStateMachineRepository);
 		}
 	}