usagestats: Reinstate argument field in BigQuery events, add allowlist for events with public arguments
Created by: attfarhan
Addresses RFC 437.
We currently do not send the argument
column to BigQuery at all. This was to avoid potentially sending private data from event logs on Cloud into our analytics systems. However, we do need the non-private data from this column. This PR adds an allowlist of event names that don't log any private data, and sends arguments along with these events to BigQuery.