add next generation formats to exercises

[tomkralidis]

Add content to exercises, as format-based exercises as well as data access (remote data).

• GeoParquet
• Zarr
• FlatGeoBUF
• PyArrow

[justb4]

See https://github.com/justb4/parquet-research some (Geo)Parquet/(Geo)Arrow research for possible new content/exercises.