Add the way to get routing params to via props

[ykrods]

In svelte5, the error like <MyComponent> was created with unknown prop 'xxx' when passing a dynamic property with <svelte:component> will be resolved. In addition, store is deprecated from svelte 5 .
Therefore, we are considering changing to assign route params to a component property called params instead of using store, and changing routeParams store to deprecated.

example

<!-- App.svelte -->
<script lang="ts">
  import Router from "svelte-spa-history-router";

  const routes = [
    { path: "/item/(?<id>.+)", component: MyComponent }
  ];
</script>
<Route {routes}/>


<!-- MyComponent.svelte -->
<script lang="ts">
  import type { RouteParams } from "svelte-spa-history-router";

  let { params }: { params: RouteParams } = $props();
</script>
<div>{ params.id }</div>

svelte 5 is still in the rc stage, so we'll wait and see how it goes to merge to main.