Feature request: Expose tx_bytes and rx_bytes in the control server api

[robinostlund]

What's the feature 🧐

It would be good to expose the tx_bytes and rx_bytes through the api on the tun interface to be able to visualize how much bandwidth is going through the tunnel + bytes per second.

Extra information and references

No response

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
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