Add rule prefer-svelte-reactivity #1071

Motivation

Hi,
I think it would make sense to add a rule that reports usage of non-reactive built-ins that have an alternative in svelte/reactivity.

I think the rule proposal needs some more work in order not to have too many false positives, but let's start a discussion

Description

Report any (?) usage of Date, Map, Set, URL, URLSearchParams.

Examples

<script>
  import { SvelteMap } from "svelte/reactivity";

  /* ✓ GOOD */

  const one = new SvelteMap();

  /* ✗ BAD */

  const two = new Map();
  const three = $state(new Map());
</script>

Additional comments

No response