core[minor], community[patch], langchain[patch]: move BaseChatLoader to core (#19607)

Thank you for contributing to LangChain!

- [ ] **PR title**: "core: move BaseChatLoader and BaseToolkit from
community"


- [ ] **PR message**: move BaseChatLoader and BaseToolkit

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/langchain/langchain/agents/agent_toolkits/base.py

@@ -1,3 +1,3 @@
-from langchain_community.agent_toolkits.base import BaseToolkit
+from langchain_core.tools import BaseToolkit
 
 __all__ = ["BaseToolkit"]

libs/langchain/langchain/agents/agent_toolkits/vectorstore/toolkit.py

@@ -1,14 +1,13 @@
 """Toolkit for interacting with a vector store."""
 from typing import List
 
-from langchain_community.agent_toolkits.base import BaseToolkit
 from langchain_community.tools.vectorstore.tool import (
     VectorStoreQATool,
     VectorStoreQAWithSourcesTool,
 )
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.pydantic_v1 import BaseModel, Field
-from langchain_core.tools import BaseTool
+from langchain_core.tools import BaseTool, BaseToolkit
 from langchain_core.vectorstores import VectorStore
 
 

libs/langchain/langchain/chat_loaders/base.py

@@ -1,3 +1,3 @@
-from langchain_community.chat_loaders.base import BaseChatLoader
+from langchain_core.chat_loaders import BaseChatLoader
 
 __all__ = ["BaseChatLoader"]