Describe the bug
The SoundWaveformWidget component, which provides audio visualization functionality, appears to be not working on desktop platforms (Windows/Linux) due to missing platform channel implementations.

Questions

• Is there a plan to implement desktop platform support?
• Should we add platform checks in the example to prevent usage on unsupported platforms?

To Reproduce

1. Run the example app on Windows platform
2. Join a room with audio enabled
3. Observe the audio visualization (SoundWaveformWidget)
4. The widget fails to show audio levels due to missing platform channel implementation

Expected behavior

1. The SoundWaveformWidget should work consistently across all supported platforms
   Platform information

• Flutter version: 3.29.2
• Plugin version: 2.4.1
• Flutter target OS: Windows
• Flutter target OS version: 11
• Flutter console log:
  ════════ Exception caught by services library ══════════════════════════════════
  MissingPluginException(No implementation found for method cancel on channel io.livekit.audio.visualizer/eventChannel-085D1EC1-C4F5-44FD-8919-ED7DB233028E-1742441736477)
  ════════════════════════════════════════════════════════════════════════════════