Include number of columns in preview/sidebar view for tabular data types

[hechth]

Currently only the number of rows is displayed. It would be great if we could also display the number of columns in the dataset, so having something like 19 lines, 5 columns.

[bernt-matthias]

The best issues are those that are already solved 😀: have a look here #17492 if this is what you intended.

Will come with 24.1..

[hechth]

Amazing @bernt-matthias ! Thanks a lot!