docs, templates: update schema imports to core (#17885)

- chat models, messages
- documents
- agentaction/finish
- baseretriever,document
- stroutputparser
- more messages
- basemessage
- format_document
- baseoutputparser

---------

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

templates/self-query-qdrant/README.md

@@ -63,7 +63,7 @@ You can find the documents in the `packages/self-query-qdrant/self_query_qdrant/
 Here is one of the documents:
 
 ```python
-from langchain.schema import Document
+from langchain_core.documents import Document
 
 Document(
     page_content="Spaghetti with meatballs and tomato sauce",
@@ -108,7 +108,7 @@ chain = create_chain(
 The same goes for the `initialize` function that creates a Qdrant collection and indexes the documents:
 
 ```python
-from langchain.schema import Document
+from langchain_core.documents import Document
 from langchain_community.embeddings import HuggingFaceEmbeddings
 
 from self_query_qdrant.chain import initialize

templates/self-query-qdrant/self_query_qdrant/chain.py

@@ -3,11 +3,11 @@ from typing import List, Optional
 
 from langchain.chains.query_constructor.schema import AttributeInfo
 from langchain.retrievers import SelfQueryRetriever
-from langchain.schema import Document, StrOutputParser
 from langchain_community.embeddings import OpenAIEmbeddings
 from langchain_community.llms import BaseLLM
 from langchain_community.llms.openai import OpenAI
 from langchain_community.vectorstores.qdrant import Qdrant
+from langchain_core.documents import Document, StrOutputParser
 from langchain_core.embeddings import Embeddings
 from langchain_core.pydantic_v1 import BaseModel
 from langchain_core.runnables import RunnableParallel, RunnablePassthrough

templates/self-query-qdrant/self_query_qdrant/defaults.py

@@ -1,5 +1,5 @@
 from langchain.chains.query_constructor.schema import AttributeInfo
-from langchain.schema import Document
+from langchain_core.documents import Document
 
 # Qdrant collection name
 DEFAULT_COLLECTION_NAME = "restaurants"

templates/self-query-qdrant/self_query_qdrant/helper.py

@@ -1,7 +1,7 @@
 from string import Formatter
 from typing import List
 
-from langchain.schema import Document
+from langchain_core.documents import Document
 
 document_template = """
 PASSAGE: {page_content}