Add core events of GA.js/GTAG.js as SST-Events

[Alex Ahlgreen Westergaard]

I have finally found some reference documentation for the default events triggered by GA.js/GTAG.js and these should be implemented in this SST library to allow full sst-tracking.

https://developers.google.com/analytics/devguides/collection/ga4/reference/config
https://developers.google.com/analytics/devguides/collection/ga4/views?client_type=gtag
https://support.google.com/analytics/answer/9216061
https://support.google.com/analytics/answer/9143382
https://support.google.com/analytics/answer/9234069

[Alex Ahlgreen Westergaard]

Native GTM events are rejected through server-side tracking if any of the reserved events are present in the package.