Add support for ID3 USLT unsynced lyrics tag

Hey, when I read the tag in the audio with MetadataRetriever, it works well in FLAC, but it cannot read the contents of the UNSYNCEDLYRICS tag in MP3, it is classified into BinaryFrame and cannot parse the data inside. Does it have no support for this?

The following is example code and sample file:

  private static class DirectExecutor implements Executor {
    public void execute(Runnable r) {
      r.run();
    }
  }
  public static void getMetadata(Context context, String uri) {
    ListenableFuture<TrackGroupArray> trackGroupsFuture = MetadataRetriever.retrieveMetadata(context, MediaItem.fromUri(uri));
    Futures.addCallback(trackGroupsFuture, new FutureCallback<>() {
      @Override
      public void onSuccess(TrackGroupArray trackGroups) {
        Log.d("Metadata", "trackGroups length: " + trackGroups.length);
        for (int i = 0; i < trackGroups.length; i++) {
          Log.d("Metadata", "index: " + i + " format length: " + trackGroups.get(i).length);
          Metadata metadata = trackGroups.get(i).getFormat(0).metadata;
          if (metadata == null) continue;
          Log.d("Metadata", "index: " + i + " metadata length: " + metadata.length());
          for(int i2 = 0; i2 < metadata.length(); i2++) {
            Metadata.Entry entry = metadata.get(i2);
            if ((entry instanceof ApicFrame pic)) {
              Log.d("Metadata", "id3 ApicFrame pictureType: " + pic.pictureType + " pictureData: " + pic.pictureData.length);
            } else if (entry instanceof TextInformationFrame id3) {
              Log.d("Metadata", "id3 TextInformationFrame key: " + id3.id.toUpperCase() + " value: " + id3.values.get(0));
            } else if (entry instanceof BinaryFrame binaryFrame) {
              Log.d("Metadata", "id3 BinaryFrame key: " + binaryFrame.id + " data: " + binaryFrame.data.length);
              if ("USLT".equalsIgnoreCase(binaryFrame.id)) Log.d("Metadata", "id3 UNSYNCEDLYRICS: " + new String(binaryFrame.data, StandardCharsets.UTF_8));
            }
          }
        }
      }
      @Override
      public void onFailure(@NonNull Throwable t) {
        Log.d("Metadata", "error: " + t);
      }
    }, new DirectExecutor());
  }

test-audio.zip

Output log: