[TwigHooks] Implement autoprefixing feature

[jakubtobiasz]

This PR introduces the autoprefixing feature. Previously we were forced to pass the whole hook name while declaring it. From now, we can

a) pass a magic _prefixes variable along with the hook context (!)

{% hook 'base' with {
    _prefixes: ['app', 'sylius_twig_hooks']
} %}

b) automatically resolve the prefixes passed with the HookableMetadata and prefix the short hook name.

{# considering there are `app.index, twig_hooks.index` prefixes in the metadata object #}

{% hook 'content' %} 

{# will produce app.index.content and twig_hooks.index.content keeping the order of prefixes #}

This feature will be documented more detailed later.