/time_region_value: NUTS outmost regions menu

[mindrones]

In a WIP PR se: outmost regions we're going to clip them from the map and filter out their data to avoid doing too many things in the same PR.

Instead of creating a composite map, at least for now, if at least one outmost region has data we could overlay a list with each item being:

• a coloured dot, using she same color scale we use in the map,
• a comma-separated list of region labels in that range

The menu position could be:

• desktop/tablet: on the same side of the legend
• mobile: in the top-left corner

Eventually we could think about enhancing the legend component so that it shows labels near each bin: this way the legend would be able to show the regions in a certain range, although the layout can be problematic if we need to show too many region labels per bin.