Changes include:
- Modified code formatting to improve readability and conform to best coding practices.
- Updated type declarations using pipe (|) operator to indicate variable can hold multiple types.
- Adjusted the spacing around the pipe operator in type declarations for improved readability.

This commit fixes several areas:

1. It changes class type in BasketOrder from QUI\\Users\\User to QUI\\Interfaces\\Users\\User.

2. It refactors Order to better handle if statements and moves verification of class existence up
to the beginning. Fix involves assuming that function getInvoiceAddress and getDeliveryAddress
always return a non-null value. It also updates on how we check class exists for Shipping data.

3. In OrderInProcess, now we check if method 'toArticle' exists on the Product object before
calling it and applies similar class checking like in Order for Shipping data.

4. Corrects and standardizes the casing for exception catching in OrderProcess.

In summary, these changes lead to a safer and cleaner code base by addressing potential Null
Pointer Exceptions and ensuring the existence of classes before they are being called.

Related: #172

This commit improves the way processing status id is handled across different methods in the
ProcessingStatus module. Now, we consistently cast processing status id as string before passing it
to the config setter methods, eliminating any potential issues that might occur due to variable
type inconsistencies. Changes are applied to the Factory and Handler classes alike.

Related: #172

Updated AbstractOrder.php to return null instead of false in getShippingStatus() when the shipping
status is not set. This makes the method's behaviour more consistent.

Updated Search.php to add a condition check for class existence before retrieving shipping status.
This ensures that the code will not fail if the class is not defined.

Modified DataLayer.php to add a condition check for class existence before retrieving shipping.

Added @phpstan-ignore-next-line in Utils.php to silence phpstan for the next line of code.

Related: #172

Updated the version of `phpstan` from `1.11.8` to `1.*` and set the installed version as `1.12.13`
in .phive/phars.xml. This should ensure we're always using the latest version of `phpstan` that
matches the specified range.

Updated the `getCustomerFiles` method signature in `AbstractOrder.php` to accept an optional
boolean parameter `$parsing`. Method can now be customized to return parsed file information or raw
data.

In the ajax/frontend/basket/toOrderInProcess.php:
- The QUI\ERP\Order\Factory class was imported.
- In the event of an exception, a new order in process is created instead of just logging the
error. This change should improve the user experience by preventing any disruption in the order
process due to unexpected errors.

Improve readability and interpretability of code by explicitly stating null in union types. This
change has been applied across multiple files and functions.

PHP8.4 compatibility

Added a conditional check in src/QUI/ERP/Order/Basket/Basket.php to convert basketId to actual id
from user's session if it is a boolean value. This fixes potential issues that may arise with
non-integer basketIds.

Also, introduced a safeguard check before saving to ensure there is a valid User. If not, the save
function is exited early to prevent potential errors or undesired actions.

Changed the default value of paymentId status in the paymentChangeable list from 1 to 0 to ensure
accurate payment status representation.

Related: #176

Related: #174

Related: order-guestorder#6

Related: order-guestorder#6

For orders this is not needed. the internal instance cache causes more problems
due to the mix between uuid and id cache. the internal cache on uuid / id was therefore removed.
Orders have the data freshly fetched from the db anyway. therefore unnecessary.
In addition, a wrong order object was repeatedly retrieved when sending mail.