Add support for Google Analytics 4

[tsmyre]

Per our conversation in Slack, we want to add support for the newest version of Google Analytics (GA4), which came out this past October.

[zdavis]

Thank you for taking the time to open this feature request. The Manifold team reviewed this issue during our bi-weekly meeting and the consensus is that this feature makes sense and is in keeping with our overall vision for the platform. Moreover, we see this request as a viable candidate for development under our current available funding. We’re adding a “planned” label to this feature to indicate that we plan on completing it within our current funding cycle.

This was an automated message, but please don't hesitate to reply. Our team watches these issues closely and will respond as soon as we're able to!

[zdavis]

@1aurend this issue relates to your GDPR work. Could you reference it in your PR so we're sure it's closed when that branch goes in?

[1aurend]

Done

[1aurend]

Released in v7.1