Bug fixes

Drupal 9 compatible, bug fixes.

Issue #3011434 by cvikir, nikita_tt: Country search filter not working
Issue #2999924 by chipway: Namespace Dependencies in .info.yml
Issue #3056632 by matsbla: Replace deprecated code
Issue #2952326 by nkoporec, riddhi.addweb: Impossible to use country field in vews -
2679745 update config schema
Issue #2760243 by jacktonkin: Add a views sort plugin to sort by country name
Issue #2878696: Can't select a default country unless there are available countries selected

#3124936: When after adding new content type with content, '.admin/content' throwing fatal error.

Implement support Drupal 9

Drupal 9 compatible, non-reusable blocks and automatic block creation on config import.

• rc28
• Fixing 14 name classes new coding standards related to docs.