Add USBGuard syntax highlighting

### Feature Description

```bash
sudo vim /etc/usbguard/rules.conf
```
<img width="2256" height="1424" alt="Image" src="https://github.com/user-attachments/assets/e97b4dff-8a6d-42e3-b1b5-0e4fb771504a" />

Would help [Cropi/usbguard-notifier/issues/73#issuecomment-1349031650](https://github.com/Cropi/usbguard-notifier/issues/73#issuecomment-1349031650).

### Screenshots

_No response_