Add a rich text Twig component

[m-vo]

This introduces a _rich_text component as outlined in #6783.

This way you do not have to repeat yourself with things like this but can change it at one place:

<div class="rte">
    {{ text|csp_inline_styles|insert_tag|encode_email|raw }}
</div>

It should also make updates smoother when we add yet another filter. 😛

[leofeyer]

Thank you @m-vo.