Support Server Side Tracking GTM

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Goals

1. Have the ability to change https://www.googletagmanager.com/gtm.js with a custom domain.

Non-Goals

Background

This feature is important because a lot of companies are moving to server side tracking for privacy, better data control and bypass adblockers.

Proposal

Change the GoogleTagManager tag for something like:

<GoogleTagManager gtmId="CutomID" destination="remoteURL" />

The destination parameter can look something like: https://tracking.example.com/gtm.js

If parameter not set, we use the default GTM link.

We need also to be able to change the filename gtm.js to another name.

Some Adblockers are looking for the file name. We need to put the entire URL, including the javascript filename.

I hope it was clear.