Add ios support

[nickmeinhold]

Is this possible? The just_audio plugin does iOS from what I can see but I seem to remember you mentioning there was a limitation or something that made it not work for your use case?

Anyway just putting up an issue for discussion and happy to put some work in if you think it's worthwhile.

[Jei]

Most of the features that rely on just_audio or audio_service should work, but playback error handling is not yet supported on just_audio for iOS, and it's still a work in progress on Android (see ryanheise/just_audio#76 and ryanheise/just_audio#80).
My main problem right now is that my work computer is not Apple, so I don't have a convenient way of testing the iOS version, working on Swift/Objective C plugins, testing PRs or releasing the app on the App Store.
I'd prefer leaving this issue as future development.