Refactor: Migrate WikidataItemDetailsActivity and explore/maps package to Kotlin

The `WikidataItemDetailsActivity` has been migrated from Java to Kotlin. This includes updating the activity's structure, handling intents, setting up tabs and view pager, managing the media detail fragment, and implementing bookmark functionality. Additionally, the logic for displaying and interacting with depicted items' details, media, child classes, and parent classes has been adapted for the Kotlin implementation.

Author: Saifuddin53

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.kt

@@ -697,12 +697,12 @@ class ContributionsFragment
         }
     }
 
-    override fun onLocationChangedSignificantly(latLng: LatLng) {
+    override fun onLocationChangedSignificantly(latLng: LatLng?) {
         // Will be called if location changed more than 1000 meter
         updateClosestNearbyCardViewInfo()
     }
 
-    override fun onLocationChangedSlightly(latLng: LatLng) {
+    override fun onLocationChangedSlightly(latLng: LatLng?) {
         /* Update closest nearby notification card onLocationChangedSlightly
          */
         try {
@@ -712,7 +712,7 @@ class ContributionsFragment
         }
     }
 
-    override fun onLocationChangedMedium(latLng: LatLng) {
+    override fun onLocationChangedMedium(latLng: LatLng?) {
         // Update closest nearby card view if location changed more than 500 meters
         updateClosestNearbyCardViewInfo()
     }

app/src/main/java/fr/free/nrw/commons/explore/ExploreMapRootFragment.java

@@ -144,8 +144,8 @@ public void onMediaClicked(int position) {
      */
     @Override
     public Media getMediaAtPosition(int i) {
-        if (mapFragment != null && mapFragment.mediaList != null) {
-            return mapFragment.mediaList.get(i);
+        if (mapFragment != null && mapFragment.getMediaList() != null) {
+            return mapFragment.getMediaList().get(i);
         } else {
             return null;
         }
@@ -159,8 +159,8 @@ public Media getMediaAtPosition(int i) {
      */
     @Override
     public int getTotalMediaCount() {
-        if (mapFragment != null && mapFragment.mediaList != null) {
-            return mapFragment.mediaList.size();
+        if (mapFragment != null && mapFragment.getMediaList() != null) {
+            return mapFragment.getMediaList().size();
         } else {
             return 0;
         }