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 # 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.