[feat] Add coding standard for current version

[tuyennn]

Adding current Magento 2 Coding Standard for current base.

Feel free to correct any problem with my changes

[what-the-diff]

PR Summary

• Update and addition in various Command-related repositories
  Several properties and constructor arguments have been augmented in files like AbstractRegenerateCommand.php, RegenerateCategoryPathCommand.php, RegenerateCategoryUrlCommand.php, RegenerateCmsPageUrlCommand.php and RegenerateProductUrlCommand.php. These changes include elements such as nullable property introduction and method addition, facilitating improved operations and providing more versatility in command execution.

• Adjustments to Product Repository
  Product.php has seen an update in its construct method. This can be beneficial as it can allow more secured and flexible initialization of product components.

• Extension of CategoryUrlPathGenerator class
  In CategoryUrlPathGenerator.php, the class has been amplified for better URL path generation for categories.

• Development on RegenerateProductUrl
  In RegenerateProductUrl.php, several properties have been modified, alongside the addition of the 'execute' method. Such modifications can offer enhanced efficiency and practicality for URL regeneration tasks.

• New Classes and Preferences
  New classes and preferences have been introduced within the Elgentos\RegenerateCatalogUrls and Magento\CatalogUrlRewrite\Model\CategoryUrlPathGenerator respectively. These enhancements provide better structured and easier to manage URL regeneration processes for catalogues.