New Rule: no-slots

[baseballyama]

Motivation

slots will be deprecated in Svelte 5.
https://svelte-5-preview.vercel.app/docs/snippets#snippets-and-slots

But Svelte 5 works this. So this rule is to prevent using slots anymore.

Description

IIUC, the default slot should continue to be available. So we need to inspect things like named slots, but I'll look into the details later.

Examples

see the docs: https://svelte-5-preview.vercel.app/docs/snippets#snippets-and-slots

Additional comments

No response