Single-object viewer POC (#14)

This commit implements a Sketchfab-style single-object viewer as a minimal
proof-of-concept.

### `@storyteller/studio-web`
This is a new package to house web components for interfacing with the
`@storyteller/studio` WASM library. It currently includes a single component,
`<sts-viewer />`, which is exported from `@storyteller/studio-web/viewer`.

### `react-frontend`
This is a new application intended as a proof-of-concept and testbed for React
interop with `@storyteller/studio-web`.

Web components are currently a little bit fiddly to use in a React application.
`react-frontend/src/app/studio-viewer.tsx` demonstrates how a React-idiomatic
component can be written as a thin wrapper around a web component, and
`react-frontend/src/app/app.tsx` demonstrates that wrapper component in use.

react-frontend/vite.config.ts

@@ -0,0 +1,44 @@
+import { nxViteTsPaths } from "@nx/vite/plugins/nx-tsconfig-paths.plugin";
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
+import topLevelAwait from "vite-plugin-top-level-await";
+import wasm from "vite-plugin-wasm";
+
+import mergeAssetsDirs from "./vite-plugins/multiple-assets";
+
+export default defineConfig({
+	cacheDir: "../node_modules/.vite/react-frontend",
+
+	server: {
+		port: 4200,
+		host: "localhost",
+	},
+
+	preview: {
+		port: 4300,
+		host: "localhost",
+	},
+
+	plugins: [
+		react(),
+		nxViteTsPaths(),
+		wasm(),
+		topLevelAwait(),
+		mergeAssetsDirs([
+			"react-frontend/public",
+			"dist/studio/public",
+		]),
+	],
+
+	// Uncomment this if you are using workers.
+	// worker: {
+	//  plugins: [ nxViteTsPaths() ],
+	// },
+
+	test: {
+		globals: true,
+		cache: { dir: "../node_modules/.vitest" },
+		environment: "jsdom",
+		include: ["src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}"],
+	},
+});