Events constructor

Implementation

external factory Events(
    {PlayerEventHandler<PlayerEvent> onReady,
    PlayerEventHandler<OnStateChangeEvent> onStateChange,
    PlayerEventHandler<OnPlaybackQualityChangeEvent> onPlaybackQualityChange,
    PlayerEventHandler<OnPlaybackRateChangeEvent> onPlaybackRateChange,
    PlayerEventHandler<OnErrorEvent> onError,
    PlayerEventHandler<PlayerEvent> onApiChange});