Add possibility to import menus directly from Drupal 7

System information

• Drupal Core Version: ^10.2 || ^11
• Menu Migration Version: 4.0.1
• PHP Version: 8.1 to 8.3

Problem/Motivation

It would be great to have an option to import menu hierarchies directly from a Drupal 7 database.

Proposed resolution

Add a new ImportSource plugin that facilitates the import.
As menu items will never be a 1 to 1 match in terms of paths, offer the possibility to override the incoming paths.
The goal of this feature is to quickly import the hierarchy which can later be edited and exported to the other environments using the existing plugins.