pinecone: Add embedding Inference Support (#24515)

**Description**

Add support for Pinecone hosted embedding models as
`PineconeEmbeddings`. Replacement for #22890

**Dependencies**
Add `aiohttp` to support async embeddings call against REST directly

- [x] **Add tests and docs**: If you're adding a new integration, please
include

Added `docs/docs/integrations/text_embedding/pinecone.ipynb`


- [x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

Twitter: `gdjdg17`

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/pinecone/langchain_pinecone/vectorstores.py

@@ -40,13 +40,12 @@ class PineconeVectorStore(VectorStore):
     Example:
         .. code-block:: python
 
-            from langchain_pinecone import PineconeVectorStore
-            from langchain_openai import OpenAIEmbeddings
+            from langchain_pinecone import PineconeVectorStore, PineconeEmbeddings
 
-            embeddings = OpenAIEmbeddings()
+            embeddings = PineconeEmbeddings(model="multilingual-e5-large")
             index_name = "my-index"
             namespace = "my-namespace"
-            vectorstore = Pinecone(
+            vectorstore = PineconeVectorStore(
                 index_name=index_name,
                 embedding=embedding,
                 namespace=namespace,
@@ -439,10 +438,10 @@ class PineconeVectorStore(VectorStore):
         Example:
             .. code-block:: python
 
-                from langchain_pinecone import PineconeVectorStore
-                from langchain_openai import OpenAIEmbeddings
+                from langchain_pinecone import PineconeVectorStore, PineconeEmbeddings
+
+                embeddings = PineconeEmbeddings(model="multilingual-e5-large")
 
-                embeddings = OpenAIEmbeddings()
                 index_name = "my-index"
                 vectorstore = PineconeVectorStore.from_texts(
                     texts,