This commit refactors the getShippingPriceFactor method in the Shipping.php file, by adding a line
break for the method's parameter for better visibility and readability.

This commit enhances the type enforcement in the Shipping module by explicitly checking for method
existence before calls on variable types. In addition, it enforces argument type checks for several
function and method declarations to avoid type-related errors. Moreover, the error handling in
different functions has been improved by catching potential exceptions and logging them for debug
purposes. The commit also optimizes a PHP sorting function by leveraging the spaceship operator
instead of using conventional comparisons.

Related: #55

This commit includes several changes to improve type handling and the returns of various methods.
It includes changes in files related to Shipping rules and status, as well as tracking. Notable
changes include:

- Refactoring of method signatures and corresponding usages to use type hinting for better error
handling.
- Fixed return types in Factory.php to return more specific types (ShippingRule and ShippingEntry).
- Adjusted the createShippingStatus method to convert `id` to string before passing it to setValue
method in Config.
- Fixed active carrier filtering in Tracking for boolean conversion.
- Modified handling and events related to shipping in ShippingEntry.php and Factory.php.
- Other minor cleanups and refactorings.

Related: #55

Updated method argument typings from `Type $var = null` to `null | Type $var = null` across
multiple files to improve readability and understanding of the code. This change aligns with modern
coding standards and the principle of explicit over implicit.
Affected files:
- `AbstractShippingEntry.php`
- `AbstractShippingType.php`
- `ShippingInterface.php`
- `ShippingTypeInterface.php`
- `Factory.php`
- `ShippingRule.php`
- `Shipping.php`

PHP9 + PHP8.3 null deprecated

This commit does the following changes:

1. Updated the PHPStan version from 1.11.8 to 1.12.13 in phars.xml
2. In various classes, added the possibility to pass `null` as a parameter to a number of
functions. Affected classes include but are not limited to: `ShippingInterface`, `Handler`,
`Status`, `StatusUnknown`, and `ShippingEntry`.
3. Updated return types in the `ShippingEntry` class to include `null` option.
4. Simplified return types in various places from `datatype|datatype|null` to possibly nullable
`datatype`.

PHP9 + PHP8.4 null deprecated

related: #54

If a standard shipping is set, it is not automatically set to erp entities if these have linked erp entities.
In this case, these erp entities have been created from the others. the shipping has then been changed, deleted, etc.

* Implemented new ERP Entity Interface
* Extension of standard shipping costs: consider country of customer
  * Now when the address is changed AND the default shipping cost is assigned, the default shipping price will be adjusted accordingly