[FEATURE] Prioritize map clustering by country instead of distance

The bug Summary: When zooming out on the map-view in Immich, bubbles of the picture count are clustered together. However, purely clustering by distance might not always be the best choice, especially if it groups pictures from different countries together. Let's look at an example picture, to better understand what I mean: When zoomed in, in this example we see 482 pictures taken in South Korea, and 232 pictures (185+47) taken in Japan. . It now looks as if 529 pictures were taken in South Korea, and only 185 in Japan - even tho that is obviously not the case. . I am aware that this is a very niche problem, bought I thought it might still be worth mentioning. The OS that Immich Server is running on Alpine Linux 3.16…