Add layer definitions for Mineralrättigheter.

Unfortunately SGU/Bergsstaten doesn't offer layer files to download, but
it has an online webmap (WMS) at https://apps.sgu.se/kartvisare/kartvisare-mineralrattigheter.html
so we add a dedicated module to probe and fetch features from it.

Double checked that the resulting combination of GeoJSON files does not
result in data loss compared to the previous (private) script:

    sort_features() { jq -S '.features |= sort_by(.properties.Name, .properties.Layer, .properties.Area)' }
    diff -u --color=auto \
            <(ogr2ogr -f GeoJSON -lco COORDINATE_PRECISION=2 /vsistdout/ $dir/Mineralrättigheter.gpkg \
                SE.GOV.SGU.MRR.BEARBETNINGSKONCESSIONER_APPLIED_VY | jq '.name = "MRR:" + .name' | sort_features) \
            <(ogr2ogr -f GeoJSON -lco COORDINATE_PRECISION=2 -nlt MULTIPOLYGON -nlt PROMOTE_TO_MULTI \
                /vsistdout/ mrr/bearbetningskoncessioner_applied.geojson | sort_features)

(and similar for other layers).

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