Adding Event Sourcing to the Monolith

We added a domain-driven design package for the monolith to use called ddd. We will need to make some updates to this package and add a new one for our event sourcing needs.

Beyond basic events

The event code we used before was just what we needed. The needs specified were to make them straightforward to instantiate, convenient to reference as dependencies, and finally, easy to work with in our handlers.