Common Examples for Vector formats

[wildintellect]

Defining a subscope of #91 for vector formats with tabular access it would be good to have examples that show:

• Spatial subsetting (e.g. BBOX typically)
• Column selection (most relevant to geoparquet)
• Row selection

Particularly with common libraries like geopandas (python) and sf (R) that allow users to limit the amount of data they read into active memory. Should be added to geoparquet and flatgeobuf at a minimum, acknowledging that these methods likely work on most OGR supported formats local or from a network path.

Overture data might be a good option for demonstrating this.

This should solve #105 also.

• TODO: A different ticket should address cross file querying with tools like DuckDB. duckdb /duckdb-spatial example for geoparquet? #92