[Feature Request] Echo Cancellation on macOS

[keyur2maru]

Thank you for developing this package! The echo cancellation feature works flawlessly on iOS, Android, and Web. However, I noticed that it is not supported on macOS or Windows. For macOS, According to the AVAudioIONode documentation, the setVoiceProcessingEnabled method is supported on macOS 10.15 and later. If this documentation is accurate, is there another reason why echo cancellation is not supported on macOS?

To troubleshoot, I tried removing the if #available(iOS 13.0, *) and #if os(iOS) checks in the record_darwin/darwin/Classes/delegate/RecorderStreamDelegate.swift file, but this didn’t resolve the issue.

If needed, I’ve shared the full diff of my changes here.