`aem.events_osgi_mapping` allow osgi application events based on a configuration value

allow osgi application events based on a configuration value

add the following https://github.com/adobe/aio-lib-java/blob/main/aem/events_osgi_mapping/src/main/java/com/adobe/aio/aem/event/osgimapping/ocd/OsgiEventMappingConfig.java

```
@AttributeDefinition(name = "Allow OSGI Application Events",
description = "true/false to allow or disallow application triggered osgi events")
String osgi_allow_application_events() default false;
```

and refactor https://github.com/adobe/aio-lib-java/blob/main/aem/events_osgi_mapping/src/main/java/com/adobe/aio/aem/event/osgimapping/eventhandler/AdobeIoEventHandler.java#L69

to take the above new conf into consideration

Start with OsgiEventMappingConfig.java to understand the existing configuration pattern, then inspect AdobeIoEventHandler.java around line 69 where application-triggered OSGI events are handled. Add the configuration value and verify that the handler allows or disallows application events according to it.

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