function getPropertyTexturesInfo(propertyTextures, statistics) {
  if (!defined(propertyTextures)) {
    return [];
  }
  return propertyTextures.flatMap((propertyTexture) =>
    getPropertyTextureInfo(propertyTexture, statistics),
  );
}
Collect info about all properties of all propertyTextures, and
return as a flattened Array
@param {PropertyTexture[]} propertyTextures The PropertyTextures with properties to be described
@param {object} [statistics] Statistics about the properties (if the model is from a 3DTiles tileset)
@returns {Object[]} An array of objects containing information about each PropertyTextureProperty
@private