Primary function to read data sets (raster, vector, tabular) that are output by saga_cmd
read_output(output, raster_backend, vector_backend, .intern, .all_outputs)
the loaded objects, or NULL is `.intern = FALSE`.
list, a `options` object that was created by the `create_tool` function that contains the parameters for a particular tool and its outputs.
character, either "raster" or "terra"
character, either "sf", "SpatVector" or "SpatVectorProxy"
logical, whether to load the output as an R object