Add a function to remove all entities of a tile and their respective assets

To avoid running the lengthy SQL statement in Finalizer that removes all entities of a country, we should implement a function to remove all entities (tile and building) per tile (defined by Quadkey). This function will then be called on a tile-by-tile basis. See https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/exposure-finalizer/-/issues/8.