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

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

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

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