Add Basic User Properties to Analytics

[zachary-kent]

Summary

Modifies our analytics infrastructure to log the user's graduation year and majors with every event; a temporary solution until the migration in #804 can be safely merged.

Test Plan

If you have access to google analytics, navigate to the real time event report and look at the "User by user property card." Then, on my branch, perform some action that will log an analytics event, like adding a course. This event, with your corresponding graduation year and major, should be reflected on the analytics dashboard:

[dti-github-bot]

[diff-counting] Significant lines: 78.

[github-actions]

Visit the preview URL for this PR (updated for commit 1b420bc):

https://cornelldti-courseplan-dev--pr803-user-properties-ah11y2my.web.app

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[noschiff]

@zachary0kent how are you handling ≥ 1 major?

[KaylinChan]

I tested by adding/deleting a couple of courses as different majors on your branch, and it was reflected in the Realtime Analytics report in Users by User Property as well as Events. Everything looks good!!

[zachary-kent]

@zachary0kent how are you handling ≥ 1 major?

I log all of the user's majors as an array