API Routes for DataObjects

# packages/headless.yaml
opendxp_headless:
    
    # enable, if you want to support data object endpoints out of the box
    data_object_api_routes:
        -   class_name: News
            ## optionally, you may want to modify the route config too
            route_config:
                single:
                    action_response:
                        response_class: 'App\Domain\News\ResponseEntity\News'
                collection:
                    route:
                        action_class: 'App\Domain\Common\Action\GetDataObjectsForSiteContextQueryAction'
                    action_request:
                        request_class: 'App\Domain\Common\Query\DataObjectsForSiteContextQuery'