feat: export Sandbox

[wangcch]

You can control the preview yourself without loading the editor.

1. Separate Sandbox from Preview
2. Export Sandbox component

import { Sandbox, useStore } from '@vue/repl'

const store = useStore(
  {
    vueVersion: ref('3.5.13'),
  },
  location.hash,
)

return () => h(Sandbox, { store })

[vercel]

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