Feature Request: Include `generateStaticParams` Function in Generated `layout.tsx` Files

Description

There is an issue in the current version of the package where the generateStaticParams function is not being included in the generated layout.tsx files. This function is useful for specifying static parameters direclty from layout in Nextjs app router.

Steps to Reproduce

Create a new nextjs application with npx create-next-app
Install next-roots and its dependencies
Provide a basic roots.config.js file
Move src/app/layout.tsx and src/app/page.tsx under src/roots/
Create a layout.tsx file under a src/roots/[category] directory.
Export a generateStaticParams function from the layout.tsx file.
Use the package to generate files under the src/app/ directory.

Example:

roots.config.js

const path = require('path')

module.exports = {
    originDir: path.resolve(__dirname, 'src/roots'),
    localizedDir: path.resolve(__dirname, 'src/app'),
    locales: ['en', 'cs'],
    defaultLocale: 'en',
    prefixDefaultLocale: false, // serves "en" locale on / instead of /en
}

src/roots/[category]/layout.tsx

export default function CategoryLayout({ children }: { children: React.ReactNode }) {
    return <>{children}</>
}

export async function generateStaticParams(props: any) {
    return [{ category: 'a' }, { category: 'b' }]
}

Generated src/app/(en)/[category]/layout.tsx


import CategoryLayoutOrigin from '../../../roots/[category]/layout'

export default function CategoryLayout(props:any) {
  {/* @ts-ignore */}
  return <CategoryLayoutOrigin {...props} locale="en" />
}

// `generateStaticParams` function is missing here

Expected Behavior

The generateStaticParams function should be included in the generated layout.tsx files.

Expected Generated src/app/(en)/[category]/layout.tsx

import CategoryLayoutOrigin from '../../../roots/[category]/layout'

export default function CategoryLayout(props:any) {
  {/* @ts-ignore */}
  return <CategoryLayoutOrigin {...props} locale="en" />
}

import { generateStaticParams as generateStaticParamsOrigin } from '../../../roots/[category]/layout'

export async function generateStaticParams() {
  return generateStaticParamsOrigin({ locale: 'en' })
}

Environment

Package version: 3.8.0
Nextjs version: 14.2.5

Proposed Solution

Include the generateStaticParams function from the original layout.tsx file in the generated layout.tsx files.

Pull Request

I work on a PR for this.

Additional Context

Related to Issue #242

Feel free to reach out if you need any additional information or clarification regarding this issue.

svobik7 / next-roots