Add microsoft building footprints to get-buildings

[cholmes]

The microsoft building footprints are hosted on planetary computer as GeoParquet, partitioned by quadkey. So set up right for the get-buildings tool. The main challenge to sort out to add it is to get the auth right. I believe auth is required to get at the data. But anyone can sign up for planetary computer, and it might work with any azure account (I'm not sure). The new azure extension for duckdb may also help with this.