Feature Request: Embedding model support

[christianazinn]

Currently neither lmstudio-js nor lms appear to support embedding models. They are listed with lms ls but have no option to load with lms load or the TypeScript library. I'd like to have embeddings support for lmstudio-js for better integration of embeddings into TypeScript apps. This should approximately entail the ability to load embedding models and query the API with some kind of embed function which takes a string list and returns a list of float lists (or more accurately, a kind of EmbeddingsPredictionResult with that as its content field - I don't think the endpoint supports streaming so no need for an OngoingPrediction).