[expo-av][iOS] Fix compilation on tvOS

[douglowder]

Why

Allow the expo-av module to compile on Apple TV.

How

To safely do this without heavy modification of EXAV.m, the podspec is modified so that tvOS uses a separate module implementation EXAVTV.m, with the audio recording code removed and stub module methods for those features.

Test Plan

• Tested on a test app with Expo 50 alpha packages and the TV plugin
• CI should continue to pass

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[linear]

ENG-10042 Add Apple TV support to Expo SDK

Now that React Native TV repo is at 0.72.4, even with core, we can start adding partial support for Apple TV.

Included:

• Support for the modules used in all apps created with create-expo-app
• Support for expo-updates
• Support for expo-av (minus recording features)
• Support for expo-apple-authentication
• Custom template for TV (maybe expo-template-tv)

Possibly included in future:

• expo-router
• expo-dev-client and friends

Excluded:

• Modules specifically for phone features, or web features (no web on Apple TV)
  • expo-camera
  • expo-barcode-scanner
  • expo-battery
  • expo-cellular
  • expo-contacts
  • expo-face-detector
  • expo-haptics
  • expo-local-authentication
  • expo-location
  • expo-screen-capture
  • expo-screen-orientation
  • expo-sensors
  • expo-speech
  • expo-standard-web-crypto
  • expo-status-bar
  • expo-web-browser

[Kudo]

looks good. didn't check the code in EXAVTV.m though. it would be even better if we in the future could split shared code into base class like EXAVBase.m.

[tsapeta]

Since we mostly just need to remove methods related to audio, I'm more in favor of not supporting tvOS in expo-av and do this in our new experimental expo-video instead. That should be much easier and I believe we don't really want to maintain tvOS support in both, especially that the API of the latter package will be much different (and already in Swift).

[douglowder]

@tsapeta since expo-video work is going to take some time, I would propose this:

• In this PR, add expo-av to the existing CI that checks compilation on tvOS
• Go ahead and merge this PR
• Once expo-video is ready, either modify expo-av to mark it deprecated on tvOS, or simply revert this PR.

What do you think?

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