Topic Modeling: enable renaming topics in the widget

**Is your feature request related to a problem? Please describe.**
One can name topics with Edit Domain. However, this only applies to Corpus output, not All Topics output, which you also wish to observe. So one has to rename the topics twice.

**Describe the solution you'd like**
Enable an option to rename the topics in the widget, which would then apply this to both Corpus and All Topics output.

**Describe alternatives you've considered**
Have Edit Domain use partial matching of feature names, but this is too cumbersome imo.

**Additional context**
Inspecting topic similarity in MDS need proper topic labels.

Start by locating the topic-modeling widget and its Corpus and All Topics outputs, then inspect how Edit Domain currently renames topics. Add a widget-level renaming option whose labels are used by both outputs, and verify that the renamed labels appear consistently when inspecting topic similarity in MDS.

Written by the indexing model from the issue text.