Map Layers: Include Explanations for Terminology

[sosiology]

Is your enhancement related to a problem? Please describe. This enhancement is really only usable for expert users who already know exactly what they're looking for. It's not meant to simply provide map styles for the general chart editor. The issue stems from both the high number of styles and the layer naming conventions.

Describe the solution you'd like And idea could be to include explanations for WMS and WMTS terminology. We could have two drops-downs one with the label WMS and underneath another one with the label WMTS. Behind the label could be an info icon explaining the name and the usage. Additionally, I found it problematic that the first three dropdown options lack any names. But of course I understand that this comes from the data.

Describe alternatives you've considered

Use cases and impact This change would make the feature more accessible to all users, not only expert users.

Additional context Initially posted by @KerstinFaye in a comment here: https://github.com/visualize-admin/visualization-tool/issues/2068#issuecomment-2685228390