Send events to Snowflake in the format they're expected by Amplitude (#20765)

This will allow us to use the events table directly in Amplitude, which
lets us use the newer event ingestion flow that detects changes to the
table. Otherwise we'll need a transformation.

I think Amplitude's API is probably a pretty good example to follow for
the raw event schema, even if we don't end up using their product. They
also recommend a "Noun Verbed" format for naming events, so I think we
should go with this. This will help us be consistent and encourage the
author of events to think more clearly about what event they're
reporting.

cc @ConradIrwin 

Release Notes:

- N/A