Add Google Analytics event tags to track specific events

[scimap]

Add Google Analytics event tags to track the following events:
Here is an old report showing the naming schema we use for event tags. They need to be named such that we non-devs can identify them in the GA reports: https://docs.google.com/document/d/1wLb4tsfavga0l_ruZjGuNSOZYMSYLwcW/edit

Events we'd like to track:
Launch iteration carousel
Launch macroscope (for each macroscope)
Launch popup window "About this macroscope" (for each macroscope)
Select "more info" in "About this macroscope" popup window (for each macroscope)
Launch popup window "about places & spaces"