[Validator] Add a :with_audio validator for videos

Thanks to our video metadata extraction, we are able to validate if a video has audio or not:
```bash
ActiveStorageValidations::Analyzer::VideoAnalyzer.new(attachable).metadata
# => { width: 640.0, height: 480.0, duration: 5.0, angle: 0, audio: true, video: true }
```

