Binary Event Serialization for Marten

This is a potentially big performance optimization you can opt into starting with Marten 9.0. Not coincidentally, we re using this for CritterWatch to help optimize the responsiveness and database size for a JasperFx client this week. Marten can serialize individual event types to a binary wire format (MemoryPack, MessagePack, or anything else implementing IEventBinarySerializer) instead of the…