Added event_timestamp to /events endpoint responses

What: We're going to be making a small addition to the response on our /events endpoint to add event_timestamp, which will be a more accurate representation of when the event took place.

Why: The event_timestamp is the most definitive source of truth as to when an event occurred and therefore has utility in being exposed to REST API users.

Developer Action: No action needed, since this is an addition. If you have any questions, please reach out on Discord as we’re here to help.