Table view for merged datasets

[KerstinFaye]

Is your enhancement related to a problem? Please describe. As a user I would like to clearly distinguish which row belongs to which dataset in a table view.

Describe the solution you'd like After switching to table view I want to see the rows sorted by dataset and joined rows should be clearly marked as such.

Design File https://www.figma.com/design/Hn9wvuEYLUmdJtg4KwZYUx/visualize.admin.ch---design?node-id=5767-86810&t=8pmMqoUTZ9bQB1oI-4

https://www.figma.com/design/Hn9wvuEYLUmdJtg4KwZYUx/visualize.admin.ch---design?node-id=6046-74027&t=8pmMqoUTZ9bQB1oI-4