Add a programmatic interface to create-svelte

[Rich-Harris]

Describe the problem

create-svelte only works via the CLI, and only interactively. It would be helpful to expose a programmatic (and versioned) interface, so that we can keep a template repo up to date with sveltejs/kit (this template repo would be used to populate things like https://node.new/sveltekit, which will otherwise constantly be out of date)

Describe the proposed solution

Something like this:

import { create } from 'create-svelte';

await create(dir, {
  eslint: false,
  typescript: false,
  prettier: true
});

Alternatives considered

No response

Importance

would make my life easier

Additional Information

No response