Allow placing inline blocks into the Entity Form Field Layout configuration

Problem/Motivation

The module provides placement of the entity fields into the Layout Builder section, that is great! But usually forms require putting some additional blocks between Drupal Fields, inline blocks with custom markup, functional blocks, maybe Views blocks, etc.

And we can place these blocks in the Layout Builder for the entity view page. But not for the field layout in entity forms.

Steps to reproduce

Proposed resolution

Would be great to allow placing custom blocks into field layout too. Is it possible to implement? And if yes - how hard it is?

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet