Create a sqlmesh timeseries metric for funding received

[ryscheng]

What is it?

The timeseries_events_by_artifact model is copied into a different query processor (e.g. Clickhouse or Trino) for running the sqlmesh pipeline.

Once the funding events are in the event table, then we should write a sqlmesh model for computing timeseries metric for funding received by an artifact (an OpenCollective "collective").

Reuven's sqlmesh metrics factory should auto-rollup by project and by collection if you solve this first https://github.com/opensource-observer/oso/issues/2200