SambaNova embedding models.
To use, you should have the environment variables
SAMBASTUDIO_EMBEDDINGS_BASE_URL, SAMBASTUDIO_EMBEDDINGS_BASE_URI
SAMBASTUDIO_EMBEDDINGS_PROJECT_ID, SAMBASTUDIO_EMBEDDINGS_ENDPOINT_ID,
SAMBASTUDIO_EMBEDDINGS_API_KEY
set with your personal sambastudio variable or pass it as a named parameter
to the constructor.
