Issue: POI Queries Exclude Polygons (e.g., Police in Viladecans)

[RogerGMarch]

Currently, the POI queries in prepare_pois.py only select geometries of type Point. This approach might exclude important POIs that are stored as polygons, such as the police station in Viladecans (to be confirmed).
To ensure comprehensive POI data, we need to decide whether:

We strictly want to select points, or

1. Implement an enhancement to transform polygons into their centroid points for inclusion.
2. This issue could impact the accuracy and completeness of the POI dataset.

Steps to Reproduce:

1. Run prepare_pois.py with the POI tag that includes the police station in Viladecans.
2. Observe that the query might not include the police station if it's stored as a polygon.

Expected Behavior:

All relevant POIs, including those stored as polygons, are included in the query.

Actual Behavior:

POIs stored as polygons are excluded from the results.