MenuImportEvent now includes menu name parameter

Description

The MenuImportEvent has been enhanced to include the menu machine name as a parameter. Event subscribers can now access the target menu name during import operations.

What changed

Previously, the MenuImportEvent only provided access to the menu item data. Now it also includes the menu name being imported.

Before (4.0.x)

use Drupal\menu_migration\Event\MenuImportEvent;

public function onMenuImport(MenuImportEvent $event) {
  $menuItem = $event->getMenuItem();
  // Menu name was not accessible
}

After (4.1.0+)

<?php
use Drupal\menu_migration\Event\MenuImportEvent;

public function onMenuImport(MenuImportEvent $event) {
  $menuItem = $event->getMenuItem();
  $menuName = $event->getMenuName(); // New method
  
  // Now you can perform menu-specific logic
  if ($menuName === 'main') {
    // Handle main menu imports differently
  }
}