SpatialDataset: implement tabular presentation for notebooks.

[alshan]

Currently the output looks like this:

SpatialDataset(GEOJSON, key='geometry', map={name=[Kronstadt Naval Cathedral, Kronstadt History Museum, Kronstadt Naval Museum, City Russian Cemetery, Kronstadt Lutheran Cemetery, Vladimir Church], type=[church, museum, museum, cemetery, cemetery, church], geometry=[{"type":"Point","coordinates":[29.777455,59.991744]}, {"type":"Point","coordinates":[29.791317,59.986777]}, {"type":"Point","coordinates":[29.763422,59.996108]}, {"type":"Point","coordinates":[29.70613,60.019788]}, {"type":"Point","coordinates":[29.749861,60.002212]}, {"type":"Point","coordinates":[29.766254,59.998515]}]}, crs=null)

Expected: