Php upgrade exploration

[kilgore5]

Generated description

Below is a concise technical summary of the changes proposed in this PR:
Updates the extension to support PHP 8.3 and 8.4 by declaring previously dynamic properties across several components. Ensures compatibility with modern PHP versions while maintaining support for PHP 8.1 and 8.2.

Topic	Details
Project Config	Update composer.json to reflect support for PHP 8.1 through 8.4 and provide a detailed upgrade plan and status in PHP_8_UPGRADE_PLAN.md. Modified files (3) .gitignore PHP_8_UPGRADE_PLAN.md composer.json Latest Contributors(1) User Commit Date oscar.brennwald@kustom... first-commit August 28, 2023
PHP Compatibility	Declare missing class properties in controllers, helpers, and observers to prevent fatal errors in PHP 8.3+ caused by dynamic property assignment. Modified files (6) Controller/Adminhtml/Event/Export.php Helper/Data.php Observer/Address.php Observer/Customer.php Observer/Order.php Observer/OrderAddress.php Latest Contributors(1) User Commit Date oscar.brennwald@kustom... first-commit August 28, 2023

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