chore: add enchance config file and lint

[gvieira18]

This pull request introduces several improvements to the project's configuration, development tooling, and code quality enforcement. The main changes include adding and updating configuration files for code style, static analysis, and testing, as well as enhancing composer scripts and dependencies. Additionally, some minor code cleanups and method refactorings are present in entity collection classes.

Development tooling and configuration:

• Added .editorconfig and .gitattributes to enforce consistent editor and export-ignore settings across the project.
• Updated composer.json to include a license, sort packages, add new dev dependencies (phpstan, pest-plugin-type-coverage), and provide scripts for linting, testing, and refactoring.
• Added phpstan.neon for static analysis configuration and enhanced rector.php with improved preset usage and custom skip rules.
• Updated phpunit.xml to enforce stricter test suite settings and randomize execution order.
• Switched the pint.json preset to "laravel" and added more formatting rules for code style consistency.

Entity collection refactoring:

• Refactored fromArray static constructors in BillingEntityCollection, CouponCollection, and CustomerEntityCollection to reside only in one place per class, improving clarity and reducing duplication.

Minor code and validation improvements:

• Minor code cleanups such as property order adjustments and formatting tweaks in several entity and builder classes.
• Improved validation logic in request builder classes for more idiomatic empty array checks and missing parameter detection.

[danielhe4rt]

LGTM!