📝 Provide a description of the improvement

Currently, it's impossible to use styled <hr> element, as GHS doesn't render it in the editing view, because it is marked as an unsafe element. On the other hand, adding the horizontal line feature enables rendering, but the styling is lost.

This ticket is about adding support for <hr> element in GHS, so it will render in the editing view and keep the original styling.

Example markup:

<hr style="height: 5px;background: teal;margin: 20px 0;box-shadow: 0px 0px 4px 2px rgba(204,204,204,1);">

Related: #9960

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