docs, community[patch], experimental[patch], langchain[patch], cli[pa… (#15412)

…tch]: import models from community

ran
```bash
git grep -l 'from langchain\.chat_models' | xargs -L 1 sed -i '' "s/from\ langchain\.chat_models/from\ langchain_community.chat_models/g"
git grep -l 'from langchain\.llms' | xargs -L 1 sed -i '' "s/from\ langchain\.llms/from\ langchain_community.llms/g"
git grep -l 'from langchain\.embeddings' | xargs -L 1 sed -i '' "s/from\ langchain\.embeddings/from\ langchain_community.embeddings/g"
git checkout master libs/langchain/tests/unit_tests/llms
git checkout master libs/langchain/tests/unit_tests/chat_models
git checkout master libs/langchain/tests/unit_tests/embeddings/test_imports.py
make format
cd libs/langchain; make format
cd ../experimental; make format
cd ../core; make format
```

templates/neo4j-advanced-rag/ingest.py

@@ -2,12 +2,12 @@ from pathlib import Path
 from typing import List
 
 from langchain.chains.openai_functions import create_structured_output_chain
-from langchain.chat_models import ChatOpenAI
 from langchain.document_loaders import TextLoader
-from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.graphs import Neo4jGraph
 from langchain.prompts import ChatPromptTemplate
 from langchain.text_splitter import TokenTextSplitter
+from langchain_community.chat_models import ChatOpenAI
+from langchain_community.embeddings.openai import OpenAIEmbeddings
 from langchain_core.pydantic_v1 import BaseModel, Field
 from neo4j.exceptions import ClientError