Allow configuration of tags

[loevgaard]

Proposed by @JulienLoison

Allow to configure the bundles as such:

setono_tag_bag:
    app.my_awesome_tag:
        type: Setono\TagBag\Tag\TwigTag
        template: 'tag_something.html.twig'

and have a corresponding Twig function to render it:

{{ setono_tag_render('app.my_awesomme_tag') }}