Feature: #98171 - Add Extbase TypeConverter for enums

Description

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.

Example

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

Impact

Enums can now be used as Extbase action arguments.