Tag processing event messages
Tag processing event messages

Tag the messages logged by the dispatchers as events. This allows the
log to be grepped to easily see the highlights of a processing run

ex:
https://gist.github.com/brendandeere/6d92094cc9664f105334caaae4eb0bda

solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions