public static TileArchiveMetadataJson create(List<LayerAttrStats.VectorLayer> vectorLayers) {
      return vectorLayers == null ? null : new TileArchiveMetadataJson(vectorLayers);
    }
Returns a copy of this instance with {@link #json}'s {@link TileArchiveMetadataJson#vectorLayers()} set to
{@code layerStats}.
planetiler-core/src/main/java/com/onthegomap/planetiler/archive/TileArchiveMetadata.java