Bug fixes

Changelog:

#3530210: Support LMS reference revisions
#3540209: Removed toolbar from required dependencies
#3540096: Moves classes to an optional submodule
#3543206: Fixes related to the students' view.

Changelog:

1. No issue: Fixed nav block structure cache invalidation
2. #3540096: Prepare for moving lms_classes to a submodule (enable lms_classes stub module after upgrading to allow easy transition)

Drupal 11 compatible release.

• Issue #3180536 by piggito, eduardo morales alberti: Missing config schema
• Issue #3429277 by phjou, danrod, johnpicozzi: Drupal 11 compatibility fixes

PHPCS issue fixed.

This release includes: