Add a Legend to the LayerList

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      document.querySelector("arcgis-layer-list").listItemCreatedFunction = (event) => {
        const { item } = event;

        // Exclude group layers, otherwise the legend will be displayed twice
        if (item.layer.type != "group") {
          item.panel = {
            content: "legend",
            open: true,
          };
        }
      };