Turn off normalization of type keys

[tstauer]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Fixed tickets	fixes #issuenum
Related issues/PRs	#issuenum
License	MIT

What's in this PR?

Turn off normalization of type keys in the Symfony config loader.

Why?

The type keys of the configuration must match the tag type of tags by the name sulu_article.type from article XML files.
See here about the Symfony feature:
https://symfony.com/doc/current/components/config/definition.html#normalization

Example Usage

See press-release in the following config file. It must not be normalized to press_release.

sulu_article:
    index_name: '%env(resolve:ELASTICSEARCH_INDEX)%'
    hosts:
        - '%env(resolve:ELASTICSEARCH_HOST)%'
    types:
        press-release:
            translation_key: "app.article_types.press-release"

[niklasnatter]

Good catch - thank you! 🙂