Add container extend method

[Chemaclass]

📚 Description

Currently, there is no possibility of extending a service from the Container in any way. However, it would be handy to be able to extend a service functionality from your GacelaConfig configuration.

🔖 Changes

• Added GacelaConfig::extendService(id, service)

🧪 Example

Note: tests/Feature/Framework/ExtendService/FeatureTest.php

Gacela::bootstrap(__DIR__, static function (GacelaConfig $config): void {
    $config->extendService( # <------------ this is the new method
        DependencyProvider::ARRAY_AS_OBJECT,
        static function (ArrayObject $arrayObject): void {
            $arrayObject->append(3);
        }
    );
});
/************************************************************************/
final class DependencyProvider extends AbstractDependencyProvider
{
    public const ARRAY_AS_OBJECT = 'ARRAY_AS_OBJECT';

    public function provideModuleDependencies(Container $container): void
    {
        $container->set(self::ARRAY_AS_OBJECT, new ArrayObject([1, 2]));
    }
}
/************************************************************************/
final class Factory extends AbstractFactory
{
    public function getArrayAsObject(): ArrayObject
    {
        return $this->getProvidedDependency(DependencyProvider::ARRAY_AS_OBJECT);
    }
}
/************************************************************************/
final class Facade extends AbstractFacade
{
    public function getArrayAsObject(): ArrayObject
    {
        return $this->getFactory()->getArrayAsObject();
    }
}

/************************************************************************/
$facade = new Module\Facade();
$facade->getArrayAsObject(); // === new ArrayObject([1, 2, 3])

[Chemaclass]

This PR is just about extend(). The factory() was implemented here: #229

[JesusValera]

We need to write some doc regarding these changes 👀