Feat: Added in memory_service and plan_service features

typings/langchain_community/__init__.pyi

@@ -0,0 +1 @@
+# Type stubs for langchain_community

typings/langchain_community/chat_message_histories/__init__.pyi

@@ -0,0 +1,15 @@
+# Type stubs for langchain_community.chat_message_histories
+
+from typing import Any
+
+class SQLChatMessageHistory:
+    def __init__(
+        self,
+        session_id: str,
+        connection_string: str,
+        table_name: str = "message_history",
+    ) -> None: ...
+    @property
+    def messages(self) -> list[Any]: ...
+    def add_message(self, message: Any) -> None: ...
+    def clear(self) -> None: ...