Add option to save also the individual model results

[iona5]

Currently we just save the ensemble result.

For debug purposes and to enhance reproducability, we should have the option to export the results of the submodels (TCVIS, NOTCVIS) as well.

adds the cli parameter write_model_outputs. Model results will then be saved as additional variables in the result xarray dataset.

the export functions detect the presence of the model variables and will automatically (for now) write those out as well.

The export the becomes

• pred_probabilities.tif
• pred_probabilities-tcvis.tif
• pred_probabilities-notcvis.tif
• pred_binarized.tif
• pred_binarized-tcvis.tif
• pred_binarized-notcvis.tif
• pred_segments-notcvis.parquet
• pred_segments-tcvis.parquet
• pred_segments.parquet
• pred_segments.gpkg

with the gpkg containing a layer for each output, in this case three.