Zoom to country when country filter applied

When a single country is selected in the map filter, we want to zoom in to that selected country. When multiple countries are selected, we remain on the current zoom level. Only zoom when we go from 0 to 1 country selected.
The view.fit function can be used from https://openlayers.org/en/latest/examples/clusters-dynamic.html (e.g. view.fit(extent, {duration: 500, padding: [50, 50, 50, 50]});), but the bounds of the country window have to be specified. These can be got from the country feature - using something like:
if (feature.get('NAME) === 'Uganda') { const extent = (feature as RenderFeature).getExtent()) }

AC's:

• When a single country is selected on the map filter, the map zooms in to show this country, with a bit of padding. This should be debounced to only zoom a short while after the country is selected.
• When the filter is removed, or when multiple countries are selected, the map remains zoomed. Only zoom when we go from 0 to 1 country selected.