✨ Add types for funcchain

src/funcchain/schema/types.py

@@ -0,0 +1,14 @@
+from typing import Callable, Optional, Union
+
+from langchain_core.chat_history import BaseChatMessageHistory
+from langchain_core.language_models import BaseChatModel
+from langchain_core.messages import AIMessage, HumanMessage
+from langchain_core.runnables import Runnable
+
+UniversalChatModel = Union[BaseChatModel, str, None]
+
+ChatHandler = Runnable[HumanMessage, AIMessage]
+
+ChatHistoryFactory = Callable[..., BaseChatMessageHistory]
+
+OptionalChatHistoryFactory = Optional[ChatHistoryFactory]