Enable autoconfigure for view parameter providers

[lolautruche]

Enable this awesome feature from Symfony 3.3, so that one can register a view parameter provider the following way:

services:
    _defaults:
        autoconfigure: true

    Acme\Provider\MyParamProvider: ~

This means to:

• Add $container->registerForAutoconfiguration() call in EzCoreExtraExtension (if Symfony version >= 3.3)
• Remove the alias attribute which seem unnecessary
• Use the service name as alias