CacheStatistics
Statistics about the media files being cached.
export class CacheStatistics {
  fileSize?: number;
  cacheSize?: number;
  downloadSize?: number;
}
            
            Attributes
- fileSize
 - The size (bytes) of the media file being played.
 - cacheSize
 - The size (bytes) of the media file that you want to cache.
 - downloadSize
 - The size (bytes) of the media file that has been downloaded.