Normalize geo coordinate Place properties

Similar to what we do for string-based address properties, move those to
the geo property instead.

Allows importing from osmcal.org for example (once
thomersch/openstreetmap-calendar#158 is deployed
there at least to fix the missing @type for the location property).

autotests/jsonlddata/place-coordinate-propagation.in.json

@@ -0,0 +1,18 @@
+[
+    {
+        "@context": "https://schema.org",
+        "@type": "Event",
+        "endDate": "2024-03-11T21:30:00+08:00",
+        "eventStatus": "https://schema.org/EventScheduled",
+        "location": {
+            "@type": "Place",
+            "address": "MozSpace Taipei, 94, Section 1, Bade Road, Zhongzheng District, Huashan, Taipei, Taiwan",
+            "latitude": 25.044068,
+            "longitude": 121.532182
+        },
+        "modifiedTime": "2024-03-03T00:00:00",
+        "name": "OpenStreetMap x Wikidata Taipei #62",
+        "startDate": "2024-03-11T19:30:00+08:00"
+    }
+]
+

autotests/jsonlddata/place-coordinate-propagation.out.json

@@ -0,0 +1,21 @@
+[
+    {
+        "@context": "http://schema.org",
+        "@type": "Event",
+        "endDate": "2024-03-11T21:30:00+08:00",
+        "location": {
+            "@type": "Place",
+            "address": {
+                "@type": "PostalAddress",
+                "streetAddress": "MozSpace Taipei, 94, Section 1, Bade Road, Zhongzheng District, Huashan, Taipei, Taiwan"
+            },
+            "geo": {
+                "@type": "GeoCoordinates",
+                "latitude": 25.0440673828125,
+                "longitude": 25.0440673828125
+            }
+        },
+        "name": "OpenStreetMap x Wikidata Taipei #62",
+        "startDate": "2024-03-11T19:30:00+08:00"
+    }
+]

src/lib/json/jsonldimportfilter.cpp

@@ -121,6 +121,22 @@ static void filterPlace(QJsonObject &obj)
             {"streetAddress"_L1, addr.toString()},
         });
     }
+    // same for geo coordinates
+    const auto lat = obj.value("latitude"_L1);
+    const auto lon = obj.value("longitude"_L1);
+    if (lat.isDouble() && lon.isDouble()) {
+        auto geo = obj.value("geo"_L1).toObject();
+        if (!geo.contains("@type"_L1)) {
+            geo.insert("@type"_L1, "GeoCoordinates"_L1);
+        }
+        if (!geo.contains("latitude"_L1)) {
+            geo.insert("latitude"_L1, lat);
+        }
+        if (!geo.contains("longitude"_L1)) {
+            geo.insert("longitude"_L1, lat);
+        }
+        obj.insert("geo"_L1, geo);
+    }
 }
 
 static void filterFlight(QJsonObject &res)