feat: add Grid component

src/Grid/Row.svelte

@@ -0,0 +1,19 @@
+<script>
+  export let as = false;
+  export let condensed = false;
+
+  $: props = {
+    ...$$restProps,
+    class: [$$restProps.class, "bx--row", condensed && "bx--row--condensed"]
+      .filter(Boolean)
+      .join(" ")
+  };
+</script>
+
+{#if as}
+  <slot {props} />
+{:else}
+  <div {...props}>
+    <slot />
+  </div>
+{/if}