Add support for storing OOB events into different storage

[charlessolar]

OOB events, which I use currently for events on entities which don't affect state (example would be cpu measurements every second on an entity monitoring performance) are currently stored in eventstore.

For intense apps these events end up being 90% of the data in the store, and you can argue that sometimes events that are older than a certain age no longer matter at all.

Aggregates.NET can export an interface to allow users to write OOB events to a different storage mechanism which more easily allows for archiving and deletion or even perhaps just sends directly to the consumer (NSB) skipping the store all together when storage of these events doesn't matter.