Improve `rename` option JSDoc

Add the ability to transform file structure.

```
viteStaticCopy({
  targets: [
    {
      src: [
        'node_modules/my-lib/dist/**/*',
      ],
      dest: '.',
      transformStructure: (path) => path.replace('node_modules/my-lib/dist/', '')
    },
  ],
  structured: true,
}),
```