Allow the sidebar for the node form to be used on other entity forms as well

When using this patch in conjunction with the Webform module, the author meta information will always be there when the Webform is rendered.
Not being able to see the Author (user) name will result in a Label only form element.

I've updated the patch from #39 to work with D10.1

Fixed CCF for 10.1.x.
Please review.

I don't think this is in the right component, because most of the changes are in the entity component and the node module.

Re-rolled #48 for 10.2.x

Fixed some missed files on #50

If going to stick with patches please provide an interdiff between patches. #51 went from 31.54 to 14.88 with no interdiff or explanation.

Recommendation is MR btw.

Issue summary should follow standard issue template.

Thanks

https://www.drupal.org/project/drupal/issues/2519362 📌 Redesign the menu link add form to be less overwhelming Needs review recently went into 11.x; it includes a form-two-columns abstraction which looks similar to what this issue is trying to achieve. Since that's actually in core and now a precedent, does it make sense for the work here to change and adapt to it?