Investigate dropping the CJS build

[benmccann]

Describe the problem

We have to distribute the CJS build for eslint-plugin-svelte (sveltejs/eslint-plugin-svelte#808) and the REPL

Describe the proposed solution

check if we can use something like https://esm.sh/stable/svelte@5.0.0-next.171/esnext/compiler.js or https://esm.sh/stable/svelte@5.0.0-next.171/esnext/compiler/index.js?bundle-deps

or create a separate package just for the REPL

Importance

nice to have

[Conduitry]

Are we okay with saying that you need to upgrade to ESLint 9 as part of migrating a project to Svelte 5?