[MacOS] Deep links conflict with App Links package

Hello !

I fill this issue related to [my comment](https://github.com/supabase/supabase-flutter/issues/554#issuecomment-1652715942) on supabase project.

If you use `flutter_appauth` with [`app_links`](https://pub.dev/packages/app_links) package to handle deep links, it seems that you can handle deep links on iOS but not MacOS. I don't know if it's expected, I tried to look at the ios/macos implementation of the package but I'm not good enough in native to find the cause.

If this behavior is normal can you explain to me so I can think of another implementation on my side.
Thanks !

Start by reproducing the deep-link setup with flutter_appauth and app_links on macOS, then compare the package's ios/macos implementations mentioned in the report. Confirm whether the conflict is expected and document the cause, or provide a verified fix for handling deep links on macOS.

Written by the indexing model from the issue text.