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/__init__.py

@@ -1,6 +1,8 @@
+from langchain_pinecone.embeddings import PineconeEmbeddings
 from langchain_pinecone.vectorstores import Pinecone, PineconeVectorStore
 
 __all__ = [
+    "PineconeEmbeddings",
     "PineconeVectorStore",
     "Pinecone",
 ]