[openstreetmap/openstreetmap-website] Place a mark to show the result of a location search (Issue #3980)

[sjvudp]

### Problem

If you search for some place (e.g. by specifying coordinates), OSM shows some part of a map, but it does not (in contrast to Google maps) a marker where the location searched actually is.
Instead such marker is only displayed while you hover the mouse over the coordinates.
Specifically when zooming in, the lack of a (temporarily) persistent marker makes the job of keeping the location more difficult than it has to be.

### Description

Place a point maker on the result of a location search. Maybe even (if the result is not point-type) draw an outline marking the search result.
Such marker should be "permanent" until the used decides to dismiss it.
A probably useful extension could be to allow multiple "permanent" markers on the map.

### Screenshots

Example (you can try to enter the same coordinates):
![Screenshot 2023-03-21 at 22-43-32 OpenStreetMap](https://user-images.githubusercontent.com/6734808/226748776-8e492709-f0f4-44be-a242-7d73786c412e.jpg)


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