added mqtt log events group_added and group_removed (#3016)

lib/extension/bridgeConfig.js

@@ -249,6 +249,7 @@ class BridgeConfig extends BaseExtension {
 
         const group = settings.addGroup(name, id);
         this.zigbee.createGroup(group.ID);
+        this.mqtt.log('group_added', name);
         logger.info(`Added group '${name}'`);
     }
 
@@ -258,6 +259,7 @@ class BridgeConfig extends BaseExtension {
         assert(entity && entity.type === 'group', `Group '${message}' does not exist`);
         settings.removeGroup(message);
         entity.group.removeFromDatabase();
+        this.mqtt.log('group_removed', message);
         logger.info(`Removed group '${name}'`);
     }