fix: remaining android-maps-utils 5.1.1 API breaks

Two more spots the compiler hadn't reached yet in the previous fix pass:

- GeoJsonPointStyle (Kotlin, android-maps-utils 5.1.1) exposes
  isDraggable()/setDraggable(), getTitle()/setTitle(),
  getSnippet()/setSnippet() as plain functions, not var properties,
  so app-utils-ktx/GeoJSON.kt's `pointStyle.isDraggable = true` style
  assignments don't compile; switched to explicit setter calls.
- KmlContainer.getProperty() now returns String? (nullable); KML.kt
  passed it straight to Log.i's non-null second parameter, added !!
  (guarded by the existing hasProperty() check just above it).
- The JSONObject-argument GeoJsonLayer constructor is now annotated
  @throws(JSONException::class) in Kotlin, which surfaces in Java as
  a checked exception. snippets/app-utils (Java)'s
  addGeoJsonLayerJsonObject() didn't declare it; added `throws
  JSONException` to match its sibling method's existing pattern.

Author: kikoso

snippets/app-utils-ktx/src/main/java/com/example/app_utils_ktx/GeoJSON.kt

@@ -91,9 +91,9 @@ internal class GeoJSON {
 
         // [START maps_android_util_geojson_style]
         val pointStyle = layer.getDefaultPointStyle()
-        pointStyle.isDraggable = true
-        pointStyle.title = "Hello, World!"
-        pointStyle.snippet = "I am a draggable marker"
+        pointStyle.setDraggable(true)
+        pointStyle.setTitle("Hello, World!")
+        pointStyle.setSnippet("I am a draggable marker")
         // [END maps_android_util_geojson_style]
 
         // [START maps_android_util_geojson_style_specific]

snippets/app-utils-ktx/src/main/java/com/example/app_utils_ktx/KML.kt

@@ -68,7 +68,7 @@ internal class KML {
         // [START maps_android_utils_kml_access_properties]
         for (container in layer.getContainers()) {
             if (container.hasProperty("name")) {
-                Log.i("KML", container.getProperty("name"))
+                Log.i("KML", container.getProperty("name")!!)
             }
         }
         // [END maps_android_utils_kml_access_properties]

snippets/app-utils/src/main/java/com/example/app_utils/GeoJSON.java

@@ -41,7 +41,7 @@
 class GeoJSON {
     private GoogleMap map;
 
-    private void addGeoJsonLayerJsonObject() {
+    private void addGeoJsonLayerJsonObject() throws JSONException {
         // [START maps_android_util_geojson_add_jsonobject]
         JSONObject geoJsonData = // JSONObject containing the GeoJSON data
         // [START_EXCLUDE silent]