[Feature]: Check Language Parity

[Huxpro]

What problem does this feature solve?

Could you add a feature to check for parity between multiple languages? Specifically, to ensure that each Chinese .mdx file has a corresponding English .mdx file. It would also be great to specify a path scope, allowing certain directories to have intentional inconsistencies.

What does the proposed API look like?

export default {
  // Other configuration options...

  languageParity: {
    enabled: true,
    include: [
      "content/posts",            // Only check these directories for parity - default to all
      "content/articles"
    ],
    exclude: [
      "content/excluded-directory", // Exclude these directories
    ]
  }
}