Adding a class field for custom layouts

@anybody Tested https://www.drupal.org/project/layout_section_classes → in a current project, works like a charme, not only in Layout Builder, also in Layout Paragraphs.

So lets make a decision here, I am fine with installing this module if required, we dont need it as default module.

If we don't want to switch over with our existing custom options (it doesn't work in addition to those: "It will not work if a layout has already provided it's own custom plugin class"). But yeah, this would need a migration..

@thomas.frobieter I'm fine with looking into https://www.drupal.org/project/layout_section_classes → who they solve it and implement it here, if it's clean and easy, so we don't need an additional module.

Any I'm fine with just using the contrib module.

You decide, what's the better choice for you. If you think it's better to take a look at implement it ourselves, please assing @Grevil to dig into it (and please set a time limit and help him to understand what's needed and why).

Otherwise just close this and perhaps add a link to https://www.drupal.org/project/layout_section_classes → on the module page as helpful addition, with some more words so we remember it?

k, I add https://www.drupal.org/project/layout_section_classes → to the module description.