Add opt-in extension seams so an application can route memory, knowledge,
RAG, and flow persistence through a custom backend without subclassing or
threading an explicit instance through every construction site -- mirroring
the existing crewai_core.lock_store.set_lock_backend seam.
- memory: crewai.memory.storage.factory.set_memory_storage_factory
- knowledge: crewai.knowledge.storage.factory.set_knowledge_storage_factory
- rag: crewai.rag.factory.register_rag_client_factory (provider registry)
- flow: crewai.flow.persistence.factory.set_flow_persistence_factory
Each construction site consults the registered factory and falls back to the
built-in default when none is set; an explicit instance always wins. Widen
Knowledge.storage and the knowledge source base classes to BaseKnowledgeStorage
(consistent with BaseAgent.knowledge_storage) so any base-interface backend
plugs in. Runtime-free tests cover each seam.
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