Add support for DuckDB vector tiles

The DuckDB spatial extension will soon supports vector tile serve. It should be great to integrate this into leafmap. https://gist.github.com/Maxxen/37e4a9f8595ea5e6a20c0c8fbbefe955 https://github.com/duckdb/duckdb-spatial/issues/241 https://github.com/bmcandr/fast-geoparquet-features https://github.com/sunu/geoparquet-duckdb-deckgl-demo https://github.com/bartzwemmer/duckdb-vector-tiles