Move ChatMemory protocol to components.memory; rename files to use "_" convention for implementations. (#101)

python/src/agnext/components/memory/__init__.py

@@ -0,0 +1,3 @@
+from ._base import ChatMemory
+
+__all__ = ["ChatMemory"]

python/src/agnext/components/memory/_base.py

@@ -0,0 +1,19 @@
+from typing import List, Mapping, Protocol, TypeVar
+
+T = TypeVar("T")
+
+
+class ChatMemory(Protocol[T]):
+    """A protocol for defining the interface of a chat memory. A chat memory
+    lets agents store and retrieve messages. It can be implemented with
+    different memory recall strategies."""
+
+    async def add_message(self, message: T) -> None: ...
+
+    async def get_messages(self) -> List[T]: ...
+
+    async def clear(self) -> None: ...
+
+    def save_state(self) -> Mapping[str, T]: ...
+
+    def load_state(self, state: Mapping[str, T]) -> None: ...