configure(chart, item, options) {
    item.fullSize = options.fullSize;
    item.position = options.position;
    item.weight = options.weight;
  }
Sets (or updates) options on the given `item`.
@param {Chart} chart - the chart in which the item lives (or will be added to)
@param {LayoutItem} item - the item to configure with the given options
@param {object} options - the new item options.