FB10143041 - Extension sync for app extensions in Safari 16

[lapcat]

Safari 16 supports extension sync for Safari web extensions. Please also support extension sync for Safari app extensions. I've had a Safari app extension in the Mac App Store since 2018, before Safari web extensions existed. I added a Safari web extension version for the iOS App Store last year. But I can't use the new extension sync in Safari 16, because that doesn't support Safari app extensions.