AxonFramework 是做什么的？
Explain and reason about Dynamic Consistency Boundaries (DCB) and how Axon Framework 5 and Axon Server implement them. Use when the user asks about "DCB", "dynamic consistency boundary", "consistency boundary", "killing the aggregate", modeling consistency across multiple entities, "EventCriteria", "@EventCriteriaBuilder", "@EventTag", "@EventSourcedEntity", "Tag", tags vs streams, "AppendCondition", "SourcingCondition", "ConsistencyMarker", optimistic concurrency in the event store, how to choo