[DependencyInjection] Allow parameters to be used to specify Factory Service

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | None, but there is no current documentation either.

This allow to use a parameter for the factoryService of a Definition. Just like for class, file, method call, etc.

Useful mostly to allow the specification of a secondary provider. For example: A bundle might provides a feature through several services, the main/default one is specified through configuration. The features requires access to an other provider that is not a directly referenceable service. Being able to use parameter as the FactoryService allow me to do something like this:

```yaml
underlying_provider:
  class: %underlying_provider.class%
  factory_service: %main_service_name%
  factory_method: getUnderlyingServiceProvider
  arguments:
      - %whatever%
```

In the mean time, this can be achieved using:

```yaml
main_service: @%main_service_name%

underlying_provider:
  class: %underlying_provider.class%
  factory_service: main_service
  factory_method: getUnderlyingServiceProvider
  arguments:
      - %whatever%
```