Allow config as a function to create custom configs with access to dirs

[enkot]

Describe the feature

It would be great to allow users to create custom configs based on the Nuxt layers/dirs.
Use case:

export default withNuxt()
  .append((options) => {
    const { dirs } = resolveOptions(options)

    return {
      name: 'custom:layer-based-config',
      files: dirs.src?.map(srcDir => join(srcDir, `config/*.${GLOB_EXTS}`)) || []),
      rules: {
        // some rules for config directory files inside each layer
      },
    }
  })

It can be done with eslint:config:addons hook, but it is not the easiest way.

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.