Make all list field formatters also available for enum field types

Closes #3410984

enum_field.module

@@ -18,3 +18,17 @@ function enum_field_field_widget_info_alter(array &$info): void {
     }
   }
 }
+
+/**
+ * Implements hook_field_formatter_info_alter().
+ */
+function enum_field_field_formatter_info_alter(array &$info): void {
+  foreach ($info as &$fieldInfo) {
+    if (in_array('list_integer', $fieldInfo['field_types'], TRUE)) {
+      $fieldInfo['field_types'][] = 'enum_integer';
+    }
+    if (in_array('list_string', $fieldInfo['field_types'], TRUE)) {
+      $fieldInfo['field_types'][] = 'enum_string';
+    }
+  }
+}