Function run_worker 

pub(super) fn run_worker(
    id: usize,
    cache_dir: PathBuf,
    rx: Arc<Mutex<Receiver<EmbedRequest>>>,
    ready_tx: Sender<Result<usize>>,
    live_workers: Arc<AtomicUsize>,
    loaded_workers: Arc<AtomicUsize>,
    config: WorkerConfig,
) -> Result<()>