MemberPress Enhanced Ecommerce Deal Stages

At the moment the Enhanced Ecommerce integration with MemberPress only supports syncing Completed transactions.

Update it so that, similar to the WooCommerce integration (https://wpfusion.com/documentation/ecommerce-tracking/hubspot-ecommerce/#woocommerce-order-statuses) you can map MemberPress transaction status with deal stages in CRMs that support sales pipelines.

When a transaction is created in a mapped status it should be synced to the corresponding pipeline / stage, and when the status is updated later, the stage should also be updated.