EmbeddingResponse should be a List<float> rather than List<double> #219

In most algorithms, computing the dot-product for embeddings to check for text similarity will be done against 2 float arrays so it would make more sense to read the data as float rather than double.

There could always be typed CreateEmbeddingResponseFloat and CreateEmbeddingResponseDouble classes.

Great library btw, love using it!
Thanks!