feat: add `LMStudioProvider`

[cpacker]

NOTE: blocked until we get context window values available via the LMStudio API see discord thread

---

Updated for 0.3.5 beta, partially working but requests fail:

Exception: API call got non-200 response code (code=404, msg={
    "error": {
        "message": "Model \"local model\" not found. Please specify a valid model.\n\nYour models:\n\ntext-embedding-nomic-embed-text-v1.5\nh...-7b@q6_k",
        "type": "invalid_request_error",
        "param": "model",
        "code": "model_not_found"
    }
})