pinecone: init pkg (#16556)

<!-- Thank you for contributing to LangChain!

Please title your PR "<package>: <description>", where <package> is
whichever of langchain, community, core, experimental, etc. is being
modified.

Replace this entire comment with:
  - **Description:** a description of the change, 
  - **Issue:** the issue # it fixes if applicable,
  - **Dependencies:** any dependencies required for this change,
- **Twitter handle:** we announce bigger features on Twitter. If your PR
gets announced, and you'd like a mention, we'll gladly shout you out!

Please make sure your PR is passing linting and testing before
submitting. Run `make format`, `make lint` and `make test` from the root
of the package you've modified to check this locally.

See contribution guidelines for more information on how to write/run
tests, lint, etc: https://python.langchain.com/docs/contributing/

If you're adding a new integration, please include:
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in
`docs/docs/integrations` directory.

If no one reviews your PR within a few days, please @-mention one of
@baskaryan, @eyurtsev, @hwchase17.
 -->

libs/community/langchain_community/vectorstores/pinecone.py

@@ -7,6 +7,7 @@ import warnings
 from typing import TYPE_CHECKING, Any, Callable, Iterable, List, Optional, Tuple, Union
 
 import numpy as np
+from langchain_core._api.deprecation import deprecated
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.utils.iter import batch_iterate
@@ -41,24 +42,16 @@ def _is_pinecone_v3() -> bool:
     return version.parse(pinecone_client_version) >= version.parse("3.0.0.dev")
 
 
+@deprecated(
+    since="0.0.18", removal="0.2.0", alternative_import="langchain_pinecone.Pinecone"
+)
 class Pinecone(VectorStore):
     """`Pinecone` vector store.
 
     To use, you should have the ``pinecone-client`` python package installed.
 
-    Example:
-        .. code-block:: python
-
-            from langchain_community.vectorstores import Pinecone
-            from langchain_community.embeddings.openai import OpenAIEmbeddings
-            import pinecone
-
-            # The environment should be the one specified next to the API key
-            # in your Pinecone console
-            pinecone.init(api_key="***", environment="...")
-            index = pinecone.Index("langchain-demo")
-            embeddings = OpenAIEmbeddings()
-            vectorstore = Pinecone(index, embeddings, "text")
+    This version of Pinecone is deprecated. Please use `langchain_pinecone.Pinecone`
+    instead.
     """
 
     def __init__(