Change the parameter type from FlowableEngineEventType to FlowableEventType in RuntimeService .

**Describe the bug**

The `addEventListener `method of the `RuntimeService `interface, which receives an event type parameter, accepts an implementation class `FlowableEngineEventType `rather than interface `FlowableEventType`.

``` java
void addEventListener(FlowableEventListener listenerToAdd, FlowableEngineEventType... types);
```

**Expected behavior**

Change the parameter type from `FlowableEngineEventType` to `FlowableEventType`.

``` java
void addEventListener(FlowableEventListener listenerToAdd, FlowableEventType... types);
```

**Code**

Custom event type enumeration class: `RdmFlowableEventType`.

``` java
@Getter
@AllArgsConstructor
public enum RdmFlowableEventType implements FlowableEventType {

STEP_TASK_ENTERED;

}
```

Config Custom Listener With SpringBoot.

``` java
@Configuration
@RequiredArgsConstructor
public class FlowableListenerConfig {
private final RuntimeService runtimeService;
private final CustomListener listener;

@PostConstruct
public void init() {
// This line results in a compilation error.
runtimeService.addEventListener(listener, RdmFlowableEventType.STEP_TASK_ENTERED);
}

```
**Additional context**

Flowable V6.8.0 With SpringBoot.