ui.table_column link support for image columns

[gaborfodor]

Is your feature request related to a problem? Please describe

Currently only text fields can have links

link: Indicates whether each cell in this column should be displayed as a clickable link. Applies to exactly one **text** column in the table.

Describe the solution you'd like

Tables can have images via Markdown. It would be nice to make an image column clickable. Clicking on the image would appear in q.args and could be handled in the same way as for linked text columns.