adds pinecone vector store

[paulmikulskis]

Allows the rag-api to function with Pinecone as a vector store.
Configuration follows suit with the PGVector and MongoDB solutions by having details added in the .env file which are then templated into a connectionString.

The COLLECTION_NAME is used for the Pinecone Index name.

Settings needed to use Pinecone within the rag-api:

VECTOR_DB_TYPE=pinecone
COLLECTION_NAME=
PINECONE_API_KEY=
PINECONE_NAMESPACE=

[danny-avila]

Hi @paulmikulskis

There are some new conflicts.

I've added enums to help manage the addition of vector stores, please use them. Also, I would like to see all routes working with screenshots and configuration settings for your setup, because the last addition of a vector store (not yours) does not seem fully functional.

Thanks

[FinnConnor]

Moved over to #86