Add Drupal 11 support

composer.json

group.info.yml

modules/gnode/gnode.info.yml

.../group_support_revisions/group_support_revisions.info.yml

src/EventSubscriber/AnonymousUserResponseSubscriber.php

src/EventSubscriber/ConfigSubscriber.php

tests/modules/group_test/group_test.info.yml

tests/modules/group_test_config/group_test_config.info.yml

tests/modules/group_test_plugin/group_test_plugin.info.yml

.../group_test_plugin_alter/group_test_plugin_alter.info.yml

tests/modules/group_test_views/group_test_views.info.yml