Funding metric: Github sponsorships from GH accounts that are contributors to projects in a given collection

[ccerv1]

What is it?

Primarily, we need an event for Github sponsors (this currently is not available via their API, to the best of my knowledge). This would capture the GitHub owner as the to_id and the sponsor's GitHub username as the from_id. Depending on the shape of the sponsors data, the event might be more like an activity event (eg, "becomes project sponsor" on a particular day) and less like a funding event (eg, "contributes to project" with a USD amount on a particular day that could recur monthly).

Then, we would calculate a count distinct for the user name of GitHub sponsors that are also contributors to a specific collection over time. Open question about whether we'd know if someone stopped being a sponsor.