[Ookla Optimization] Add option to download Ookla data as shapefiles in addition to parquet files

[butchtm]

Rationale:

• Downloading the shapefile allows the subsequent step of filtering for the AOI much faster by using the geopandas.read_file(ooka_file, bbox=<bounding-box-of-aoi>) or geopandas.read_file(ookla_file, mask=<aoi-mask>) since it no longer has to load the whole global ookla data.