The IWriteEventAdapter type exposes the following members.
Return the manifest (type hint) that will be provided in the FromJournal(Object, String) method. Use empty string if not needed.
Convert domain event to journal event type.
Some journal may require a specific type to be returned to them, for example if a primary key has to be associated with each event then a journal may require adapters to return "EventWithPrimaryKey(event, key)".
The ToJournal(Object) adaptation must be an 1-to-1 transformation. It is not allowed to drop incoming events during the `toJournal` adaptation.