Put a config to sync only customers with orders

[gonzaloebiz]

Preconditions

Any magento version with sample data
Any version of mc-magento2 <= 10x.x.65
Configure the extension and cron

Steps to reproduce

1. Wait to sync all customers and orders

Actual and Expected result

All customers are synced, those orders, and those without orders.
The idea is to add the ability to sync only customers with orders and skip the customers without orders