Add embedding service to edsl + coopr

[johnjosephhorton]

It's super common when doing edsl work to want to take embeddings - we should support that through coopr as well.

def get_embeddings(texts, model="text-embedding-3-large"):
    # Clean the texts
    texts = [text.replace("\n", " ") for text in texts]
    
    # Get embeddings for all texts in one API call
    response = client.embeddings.create(input=texts, model=model)
    
    # Extract embeddings from response
    return [data.embedding for data in response.data]