[Ecommerce][Tracking] add GTM tracker

[ljthiel]

Add support for tracking via gtm dataLayer

todos:

• definitely more testing
• apply changes from [Ecommerce][Tracking] TrackingManager improvements #5347

[fashxp]

should we merge this first and then add necessary changes from #5347 in #5347?

[ljthiel]

should we merge this first and then add necessary changes from #5347 in #5347?

Seems like a good idea :)
Methods for the TrackingCodeAwareInterface should be implemented already.

[fashxp]

is this now finished and ready to be reviewed? @ljthiel @markus-moser

[markus-moser]

should be ready to be reviewed

[fashxp]

thx!

[blankse]

@ljthiel I get an error now, when the PimcoreEcommerceFrameworkBundle is not activated:
Cannot autowire service "Pimcore\Analytics\GoogleTagManager\EventSubscriber\TrackingCodeSubscriber": argument "$trackingManager" of method "__construct()" references class "Pimcore\Bundle\EcommerceFrameworkBundle\Tracking\TrackingManager" but no such service exists.

[fashxp]

@blankse should be fixed now, can you please recheck?

[blankse]

@fashxp Yes it works now. Thank you!