feat(components): add StructuredList

Closes #27

src/components/StructuredList/StructuredListCell.svelte

@@ -0,0 +1,20 @@
+<script>
+  let className = undefined;
+  export { className as class };
+  export let head = false;
+  export let noWrap = false;
+  export let style = undefined;
+
+  import { cx } from '../../lib';
+
+  const _class = cx(
+    head && '--structured-list-th',
+    !head && '--structured-list-td',
+    noWrap && '--structured-list-content--nowrap',
+    className
+  );
+</script>
+
+<div on:click on:mouseover on:mouseenter on:mouseleave class={_class} {style}>
+  <slot />
+</div>