Display status of connection in title bar

Some long-running receiver type should have their status displayed in the top bar as per @martenbjork design:

<img width="494" alt="image" src="https://github.com/rerun-io/rerun/assets/49431240/916c2641-223e-4b22-a6e6-2437181fa3fb">
