[Device]: Add support for logitech mouse M720

### Pre-flight checklist

- [x] I quit **Logi Options+** before testing.
- [x] I searched existing issues for my device.

### Device model

M720

### Connection

Other / not sure

### What's the problem?

Requesting support for a device not yet supported

### `openlogi list` output

```text
-
```

### `openlogi diag features` output

```text

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### Details

Please add support for the Logitech M720 mouse.

It would be helpful if OpenLogi could detect this device and support its common configuration features, such as DPI, SmartShift, thumb wheel, and button/gesture customization where supported by the device.

Thanks for considering this device request.

Start by running `openlogi list` and `openlogi diag features` with the M720 connected, since the issue's reported outputs are empty. Compare the device's detected capabilities with the requested DPI, SmartShift, thumb-wheel, and button or gesture configuration features. Done means OpenLogi detects the M720 and supports the common features that the device exposes.

Written by the indexing model from the issue text.