Extend the display of the info command
The info command already informs about a given tilecontent. Promote this to the tileset level and extend the displayed information.
User story/Use caser
As user I want to display the advanced information concerning a tileset e.g. the
- number of tiles
- extensions used by the tileset
- for each tile
- number of batch entries (number of features)
- size (memory footprint?) of the tile
- the names of the attributes held in the batch table (keys of the json part of the batch-table seen as dictionary)