Topic Modeling: show word weights

**Is your feature request related to a problem? Please describe.**
When looking at the results of topic modeling, it is unclear from the image what weights are assigned to each word.

**Describe the solution you'd like**
Show weights in some sensible way. Perhaps with different levels of bold? Colors (shades of grey)? Sizes (probably not)?

**Describe alternatives you've considered**
Ok, one can observe the weights in the Data Table, but this requires another widget and parallel windows. It would be nice to have this information directly in the widget.

**Additional context**
Some words have very low weights so it is not entirely clear how to interpret a topic unless one knows the weights.

Start by locating the topic modeling widget and reviewing how its image is generated. Compare the word weights shown in the Data Table with the widget’s current visualization, then determine a readable visual encoding for those weights. Done means the widget communicates low and high word weights directly without requiring a separate Data Table.

Written by the indexing model from the issue text.