Adding the Event Sourcing Package

Implement the event-sourced aggregates by embedding existing aggregates to support event sourcing in our application.

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The updates made to enhance the events did not add any new code to support event sourcing. Because we do not want to turn every aggregate in the application into an event-sourced aggregate, the bits necessary to support event sourcing will go into a new internal/es package.

Creating the event-sourced aggregate

To avoid having to build the aggregate from scratch, this new aggregate will contain an embedded ddd.Aggregate and provide a new constructor. Here is what we are starting with, the event-sourced Aggregate definition:

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