feat(layer): first pass at Layer component (#1932)

Closes #1892

types/Layer/Layer.svelte.d.ts

@@ -0,0 +1,27 @@
+import type { SvelteComponentTyped } from "svelte";
+
+export interface LayerProps {
+  /**
+   * Specify the layer level to override any existing levels based on hierarchy.
+   * @default undefined
+   */
+  level?: 0 | 1 | 2;
+
+  /**
+   * Specify the HTML element to render.
+   * @default "div"
+   */
+  as?: string;
+
+  /**
+   * Specify the Layer HTML element props
+   * @default {}
+   */
+  layerProps?: import("svelte/elements").HTMLElementAttributes;
+}
+
+export default class Layer extends SvelteComponentTyped<
+  LayerProps,
+  Record<string, any>,
+  { default: {} }
+> {}