feat: implement dynamic currency handling

The updates include:

• Added quiqqer/currency package to composer.json.
• Refactored code in Basket.php, OrderProcess.php and Utils.php to use the new getRuntimeCurrency function for currency handling.
• Removed hardcoded currency setting in Basket.php.
• Updated code in OrderProcess/Basket.php to correctly reference new Basket class.
• Added logic to set currency from product data in Utils.php.

These changes allow for dynamic handling of currencies across the application, reducing the need for hardcoded values and enhancing flexibility and maintainability.