Handle calling magic instantiation methods from within instance methods of the Enum

[spawnia]

• Added or updated tests
• [ ] Added or updated the README.md
• Detailed changes in the CHANGELOG.md unreleased section

Related Issue/Intent

Here is a actual code we use that did not work as expected:

use BenSampo\Enum\Enum;

/**
 * @method static Workgroup ROUTINE()
 * @method static Workgroup MLL5K()
 * @method static Workgroup MLL5Kv2()
 */
final class Workgroup extends Enum
{
    protected const ROUTINE = 'Routine';
    protected const MLL5K = 'MLL5K';
    protected const MLL5Kv2 = 'MLL5Kv2';

    /**
     * @return array<self>
     */
    public function allPrioritized(): array
    {
        switch ($this->value) {
            case self::MLL5K:
                return [
                    self::MLL5K(),
                    self::ROUTINE(),
                    self::MLL5Kv2(),
                ];
            case self::MLL5Kv2:
                return [
                    self::MLL5Kv2(),
                    self::ROUTINE(),
                    self::MLL5K(),
                ];
            default:
                return [
                    self::ROUTINE(),
                    self::MLL5K(),
                    self::MLL5Kv2(),
                ];
        }
    }
}

Calling $workgroup->allPrioritized() fails with an error message like this:

BadMethodCallException: Method App\Enums\Workgroup::ROUTINE does not exist.

Even though the call to self::ROUTINE() looks like a static method call, PHP actually treats it as dynamic and calls __call rather than __callStatic.

Changes

Allow such magic instantiation calls from within an enum.

While it is not typical to use the magic instantiation dynamically, it may happen
incidentally when calling the instantiation in an instance method of itself.
Even when using the static::KEY() syntax, PHP still interprets this is a call to
an instance method when it happens inside of an instance method of the same class.

Breaking changes

None, i took particular care to ensure that dynamic macro's stil work.