Add orderByLocale() scope for ordering results by translated JSON attributes

[eslam-dev]

This PR adds a new Eloquent scope orderByLocale() to the HasTranslations trait.

It allows developers to easily sort query results by translated JSON attributes for a specific locale in a clean and expressive way, without writing raw SQL.

This is especially useful for multi-language applications where ordering by a localized field (like name or title) is a common requirement.

The implementation is database-driver aware and supports MySQL, PostgreSQL, and SQLite out of the box.

Example usage

// Order products by their name in the current locale
Product::orderByLocale('name')->get();

// Order schools by title in Arabic (descending)
School::orderByLocale('title', 'desc', 'ar')->get();