`aem` `aio-aem-events-osgi-mapping` : Cannot make custom Event Handler Type

### Question
How to make a custom Event Handler that will be registered and has an additional custom field in the event's request payload?

### Expected Behaviour
We want a custom Page Publish event which has custom fields in the event's request payload.

1. Create **com.adobe.aio.aem.event.osgimapping.internal.OsgiEventMappingSupplierImpl-custom.cfg.json** file in config.author directory containing the following:

{
"aio.event.code": "custom_published",
"aio.event.label": "Custom Page Published",
"aio.event.description": "Custom Page Published Event",
"aio.xdm.event.type": "com.adobe.xdm.event.AemPagePublishedEvent",
"osgi.event.handler.type": "com.proj.core.eventhandler.CustomHandler",
"osgi.topic": "com/day/cq/replication",
"osgi.filter": "(&(type=ACTIVATE)(!(event.application=*)))",
"osgi.jcr.path.filter": "/content/"
}

2. CustomHandler inherits from one of the abstract classes like ReplicationEventHandler (and puts CustomPage inheriting from Page) or something else which will give access to add custom fields to the event's request payload.
3. Handler is registered and the event's request payload has defined by CustomHandler additional fields.

### Actual Behaviour
1) When tried to inherit from **ReplicationEventHandler\** (where CustomPage inherits from com.adobe.xdm.content.Page) and **AdobeIoEventHandler\**, there was a problem, because **List> getXdmObjectActorDateTriples(Event event, ResourceResolverWrapper resourceResolverWrapper)** is package-private and there cannot be a class created outside this package and implements this method.
2) When inheriting eg. from **PageReplicationEventHandler** custom handler does not work and logs say:

com.adobe.aio.aem.event.osgimapping.internal.OsgiEventMappingRegistrationServiceImpl Adobe I/O Events' OSGI Handler Registration failed: `Unreferenced/unimplemented OSGI event Handler value: com.proj.core.eventhandler.CustomHandler
com.adobe.aio.exception.AIOException: Unreferenced/unimplemented OSGI event Handler value: com.proj.core.eventhandler.CustomHandler

Start by reading OsgiEventMappingSupplierImpl and OsgiEventMappingRegistrationServiceImpl, then trace how PageReplicationEventHandler and ReplicationEventHandler are recognized. Review the package-private getXdmObjectActorDateTriples method and the unreferenced-handler error. Done means a custom handler can register from the shown mapping and add fields to the event request payload.

Written by the indexing model from the issue text.