feat: add outbox (#10)

* feat: add outbox

* Update package.json

---------

Co-authored-by: sjvans <[email protected]>

Author: David-Kunz

package.json

@@ -30,6 +30,7 @@
         "event-broker": {
           "impl": "@cap-js/event-broker",
           "format": "cloudevents",
+          "outbox": true,
           "webhookPath": "/-/cds/event-broker/webhook",
           "vcap": {
             "label": "event-broker"