Implement Backdrop / Drupal 7 features for 2.x

Problem/Motivation

@AltaGrade → wrote in ✨ Needs schema check and tests for all functionality Needs work
We have developed and keep maintained this module mainly for our Backdrop customer project, and because of Backdrop and Drupal 7 similarities the changes made on Backdrop are easy to quickly pass to Drupal 7. However, unfortunately Drupal 9/10 version is many features behind. So we do hope you can move all the new features from either Backdrop or Drupal 7 to Drupal 9/10.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes