Issue #3502442: Added install file to remove configurations on module uninstall

Closes #3502442

group_domain.install

+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for Group domain.
+ */
+
+/**
+ * Implements hook_uninstall().
+ *
+ * Deletes the configuration for field.storage.group.group_domain
+ * and clears cache.
+ */
+function group_domain_uninstall() {
+  // Get the configuration factory service.
+  $config_factory = \Drupal::service('config.factory');
+
+  // Load the configuration for field.storage.group.group_domain
+  // and delete the configuration.
+  $config = $config_factory->getEditable('field.storage.group.group_domain');
+
+  if (!$config->isNew()) {
+    // Delete the configuration.
+    $config->delete();
+  }
+
+  // Clear specific cache bins.
+  \Drupal::cache('data')->deleteAll();
+  \Drupal::cache('render')->deleteAll();
+}