Allow container injection via configuration

[tomphp]

On the rare occasion, you might want to inject the container into a service. It would be a helpful feature to be able to do with via the configuration. Maybe something like:

$appConfig = [
    'di' => [
        'services' => [
            MyService::class => [
                'arguments' => [Configurator::CONTAINER],
            ],
        ],
    ],
];

It would also be useful to have the container available in ServiceFactories. A common approach to this would be to have a ContainerAware interface and trait or abstract class.

Pros:

• Makes it easier to inject the container into services.

Cons:

• Injecting the container into services generally isn't good practice.