Feature: #98171 - Add Extbase TypeConverter for enums

See forge#98171


Since PHP 8.1 provides enums, we can also use them in our Extbase actions. A new TypeConverter \TYPO3\CMS\Extbase\Property\TypeConverter\EnumConverter was added with this feature.


Given an enum like this one:

enum ClosedStates
    case Hide;
    case Show;
    case All;

We can now use it like this in any Extbase action:

public function overviewAction(ClosedStates $closed = ClosedStates::Hide): ResponseInterface
    // ...

The URL argument can be send as [closed]=Show and is automatically converted to an instance of ClosedStates::Show


Enums can now be used as Extbase action arguments.