AVKit tvOS 15.4 to 16.0 API Differences

Added #def AVKIT_ONLY_API_DEPRECATED_WITH_REPLACEMENT

Added #def AVKIT_INIT_UNAVAILABLE

Added AVPlaybackSpeed

Added AVPlaybackSpeed.systemDefaultSpeeds

Added -[AVPlaybackSpeed initWithRate:localizedName:]

Added AVPlaybackSpeed.rate

Added AVPlaybackSpeed.localizedName

Added AVPlaybackSpeed.localizedNumericName

Added AVPlayerViewController.speeds

Added AVPlayerViewController.selectedSpeed

Added -[AVPlayerViewController selectSpeed:]