Package echo holds the presenter interfaces to use with the echo framework It is recommended to use a granularity of one file per base resource; for instance for /api/todo/v1/todos we would have the `todo_presenter.go`, for /api/todo/v1/calendars we would have the `calendar_presenter.go`, and so on.

Package event holds the presenter component for the asynchronous kafka events An initial granularity could be one file per topic, but if the events are only a few would make sense to use only one file.