Feature: Should handle multiple output

[nonzzz]

Feature request 🚀

Expected:

Vite set multiple output should be support.
see #26. If user pass the rollupOptions. the preset outDir won't be work. So what about passing in multiple outputs?

Examples:

export default defineConfig({
 build: {
    rollupOptions: {
      output: [{ dir: 'es' }, { dir: 'cjs' }]
    }
  },
})