Add basic application framework and example application to show interaction between events an NBI

Depends on:

• !340 (merged)
• !344 (merged)
• !349 (merged)
• !342 (merged)

applications/example-application/app.go

@@ -60,7 +60,7 @@ func (a *Application) callback(event *event.Event) {
 	request := &rbac.GetUserRequest{
 		Timestamp: time.Now().UnixNano(),
 		Name:      event.ID.String(),
-		Uuid:      event.EntityID.String(),
+		Id:        event.EntityID.String(),
 	}
 
 	response, err := userService.GetUser(ctx, request)