[RFC]: Add Symfony DependencyInjection as container about mezzio

[boesing]

mh, we do also have an "unofficial" laminas doctrine module. since we are not the maintainers of those container implementations, all we should do imho is to reference those packages while those packages provide documentation on how to use them.
Its okay for me to have it available in the skeleton but besides that, I rather avoid having too many details around in documentation. But these are just my 2 cents.

[froschdesign]

@boesing
The problem is that we needed to kill Pimple and Aura.Di, which means that only laminas-servicemanager is listed and documented in the documentation as the only PSR container implementation. So the feature list on the homepage does not work anymore:

Dependency Injection

Make your code flexible and robust, using the dependency injection container of your choice.

https://docs.mezzio.dev/mezzio/#features

And the same for the related introduction for containers:

To facilitate this and allow you as a developer to choose the container you prefer, mezzio typehints against PSR-11 Container, and throughout this manual, we attempt to show using a variety of containers in examples.

https://docs.mezzio.dev/mezzio/v3/features/container/intro/#containers