Added functions to generate tile geometries
- Added function to generate geometry from quadkey - taken from https://git.gfz-potsdam.de/dynamicexposure/collaboration/-/issues/241 (made by @prehn and submitted as separate commit)
- Added functions to generate geometries for vector tiles - related to https://git.gfz-potsdam.de/dynamicexposure/openbuildingmap/database-obmtiles/-/merge_requests/13