Style package load options, associated with the tileset descriptor. If provided, `offline manager` will create a style package while resolving the corresponding tileset descriptor and load all the resources as defined in the provided style package options, i.e. resolving of corresponding the tileset descriptor will be equivalent to calling the `loadStylePack` method of `offline manager`. If not provided, resolving of the corresponding tileset descriptor will not cause creating of a new style package but the loaded resources will be stored in the disk cache.