28d active projects model

Closes: #17 (closed)

28 day active projects that matches the numbers we're seeing in the Google Analytics UI.

I had to hack this a bit since Athena doesnt support distinct in window functions and doesnt support correlated subqueries. I used a macro to just compile a large union statement which works for now. I also had to add a filter at the top to update the lookback window when were using sqlfluff because it slowed it down significantly having to parse the huge union script.