Add Support to load Async Svelte component

[keuller]

What's changed?

• Add support for import components dynamically
• Map those async components via Route component
• Updated the README.md file to fix svelte5-router references instead of svelte-routing
• Updated the test application to demonstrate async route component

This PR addresses an important feature for dynamic imports, which allow us to split the app bundle in chunks.

<script lang="ts">
    import { dynamic, Router, Route } from "svete5-router";

   const AboutRoute = dynamic(import("./routes/About.svelte"));
</script>

<Router>
    <Route path="/about" component={AboutRoute} />
</Router>

[lmaccherone]

I suggest that you add .svelte-kit and dist to the .gitignore file.