Support spatiotemporal and property filtering in load_url

[VincentVerelst]

For the WorldCereal project, we have multiple datasets stored in geoparquet format. We would need to be able to:

• Filter this geoparquet file by a certain spatial and temporal extent
• Filter this geoparquet file based on certain properties (e.g. only extract items for which property "extract" == 1)

The geoparquet files are loaded in via the load_url process. Ideally, we therefore should be able to specify a spatiotemporal extent and certain property filters as arguments in load_url, such that only a subset of the full dataset is loaded in.