[doctrine] Sync index with doctrine orm object change.

[makasim]

fixes php-enqueue/enqueue-dev#244

How to use:

• Disable default sync listener:

fos_elastica:
    indexes:
        enqueue:
            types:
                blog:
                    persistence:
                        driver: orm
                        model: AppBundle\Entity\Blog
                        listener:
                            insert: false
                            update: false
                            delete: false
                            flush: false

• Enabled queue one:

enqueue_elastica:
    doctrine:
        queue_listeners:
            -
              index_name: 'enqueue'
              type_name: 'blog'
              model_class: 'AppBundle\Entity\Blog'