[openstreetmap/openstreetmap-website] Add datalist to display multiple search results (PR #6765)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> +    const selectedOption = datalist
+      .find("option")
+      .get()
+      .find(option => option.value === value);
+
+    if (selectedOption) {
+      const lat = selectedOption.getAttribute("data-lat");
+      const lon = selectedOption.getAttribute("data-lon");
+      endpoint.setValue(value, { lat, lon });
+    } else {
+      endpoint.setValue(value);
+    }

Since `.data()` returns `undefined` if there's no match, this can be shortened.

```suggestion
    const latlngObj = datalist
      .find("option")
      .filter((i, option) => option.value === value)
      .first()
      .data();
    endpoint.setValue(value, latlngObj);
```

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