feat(yt): add support for movie items and trailers

[patrickkfkan]

1. Add GridMovie and HorizontalMovieList parsers for movie-related elements (easy to find them in Explore -> Films)
2. Add PlayerLegacyDesktopYpcTrailer and YpcTrailer parsers for trailer info that appear in errorScreen of /player reponse, typically when viewing a non-purchased movie or film.
3. Add getTrailerInfo() and has_trailer getter to VideoInfo, which uses data from the parsers in (2) above. Usage:

const info = youtube.getInfo(video_id);

if (info.has_trailer) {
  const trailer_info = info.getTrailerInfo();  // Returns `VideoInfo` instance
  const format = trailer_info.chooseFormat(...);
  ...
}