Implement Universal Analytics Enhanced Ecommerce related datalayers

[MaartenWTC]

Problem

99% of our customers use Google's Universal Analytics in combination with Google Tag Manager for the reporting on the webshops.
Basic reporting can be done pretty easy. But really good ecommerce reporting is possible with Enhanced Ecommerce. And this requires data layers for various activities.

Product Impressions
Product Clicks
Product Detail Impressions
Add / Remove from Cart
Promotion Impressions
Promotion Clicks
Checkout
Purchases
Refunds

The problem is that any of our implementation projects will take longer and more expensive because this is not present OOTB in PWA
If resolved than all future implementation will be easier for the partners.

Desired solution.

Implement Universal Analytics Enhanced Ecommerce features using Google Tag Manager

alternatives considered.
none

AB#75074