[Chat] Introduce MongoDb as message store

Author: Guikingone

src/chat/CHANGELOG.md

@@ -3,14 +3,17 @@ CHANGELOG
 0.1
 ---
 
+<<<<<<< HEAD
   * Add streaming support to `ChatInterface::submit()`
     - Add `StreamableStoreInterface` which indicates `StoreInterface` implementation can be configured with streaming 
     - Add `AccumulatingStreamResult` wrapper class which adds accumulation logic & callback chaining to `StreamResult` implementations (can wrap both `Agent` and `Platform` variants) to return the full message once `Generator` is exhausted
     - Streamed responses now also create `AssistantMessage` & are added to `Store` in `Chat::submit()`
     - Bugfixed loss of metadata in `Chat::submit()`
   * Introduce the component
   * Add support for external message stores:
+    - Doctrine
     - Meilisearch
+    - MongoDb
     - Pogocache
     - MongoDb
     - Redis