Shift contributions to use Room DB (#3324)

* Part of #3127
* Added Room Dependency
* Shifted ContributionsDao to use RoomDB

* Save and Fetch contributions via RoomDAO

* Bugfixes, fixed test cases, injected schedulers for ContributionsPresenter

* removed stetho

* Fixed ReviewHelperTest cases

* Fixed test cases in DeleteHelperTest

* Fetch all contributions [TODO add pagination to use this, maybe later in a seperate PR]

* Update Schema false in AppDatabase

* removed parameter from fetchControbutions

* Added logs for fetch contributions

* Fixed test case ContributionsPresenter

* Added an autogenerate primary key, submit save contributions on executor

* fixed getItemAtPosition

* MainActivity Config changes +=orientation

* BugFixes
* Make AppDataBase Singleton
* Set _id as autogenerate primary key [replacing the previously used filename, seems like they are not unique]
* Replace Execxutor Utils with Subscribers on Singles in UploadService
* BugFix, Upload Progress

* Remove un-nescessary null check on contributions in ContributionsListAdapter

* removed ContributionsListFragment [not-implemeted]

* Review suggested changes
* removed un-nescessary null checks
* provide ContributionsDao
* Minor bug fixes

* wip

* delete existing contributions table (from the existing db) on upgrade

* remove un-nescessary null checks in test classes

* shifted media to be a local variable in ReviewHelperTest

* removed captured folder

* Dispose composite disposables in UploadService

* replaced size check with isEmpty ContributionsPresenter

* transform saveContributions to a Completable

* Addressed comments in review
* Typo in Contributions
* ReasonBuilderTest (create media object instead of mocking)
* Use global Gson object instead of creating a new one in Converters

* Provide Gson to Converters from the CommonsApplicationComponent

* use static method instead of field instead of static field to provide GSON in Converters

* Modified gitignore to exclude captures/*

app/src/main/java/fr/free/nrw/commons/db/AppDatabase.java

@@ -0,0 +1,14 @@
+package fr.free.nrw.commons.db;
+
+import androidx.room.Database;
+import androidx.room.RoomDatabase;
+import androidx.room.TypeConverters;
+
+import fr.free.nrw.commons.contributions.Contribution;
+import fr.free.nrw.commons.contributions.ContributionDao;
+
+@Database(entities = {Contribution.class}, version = 1, exportSchema = false)
+@TypeConverters({Converters.class})
+abstract public class AppDatabase extends RoomDatabase {
+    public abstract ContributionDao getContributionDao();
+}

app/src/main/java/fr/free/nrw/commons/db/Converters.java

@@ -0,0 +1,76 @@
+package fr.free.nrw.commons.db;
+
+import android.net.Uri;
+
+import androidx.room.TypeConverter;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import org.wikipedia.json.GsonUtil;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.HashMap;
+
+import fr.free.nrw.commons.CommonsApplication;
+import fr.free.nrw.commons.di.ApplicationlessInjection;
+import fr.free.nrw.commons.location.LatLng;
+
+public class Converters {
+
+    public static Gson getGson() {
+        return ApplicationlessInjection.getInstance(CommonsApplication.getInstance()).getCommonsApplicationComponent().gson();
+    }
+
+    @TypeConverter
+    public static Date fromTimestamp(Long value) {
+        return value == null ? null : new Date(value);
+    }
+
+    @TypeConverter
+    public static Long dateToTimestamp(Date date) {
+        return date == null ? null : date.getTime();
+    }
+
+    @TypeConverter
+    public static Uri fromString(String value) {
+        return value == null ? null : Uri.parse(value);
+    }
+
+    @TypeConverter
+    public static String uriToString(Uri uri) {
+        return uri == null ? null : uri.toString();
+    }
+
+    @TypeConverter
+    public static String listObjectToString(ArrayList<String> objectList) {
+        return objectList == null ? null : getGson().toJson(objectList);
+    }
+
+    @TypeConverter
+    public static ArrayList<String> stringToArrayListObject(String objectList) {
+        return objectList == null ? null : getGson().fromJson(objectList,new TypeToken<ArrayList<String>>(){}.getType());
+    }
+
+    @TypeConverter
+    public static String mapObjectToString(HashMap<String,String> objectList) {
+        return objectList == null ? null : getGson().toJson(objectList);
+    }
+
+    @TypeConverter
+    public static HashMap<String,String> stringToMap(String objectList) {
+        return objectList == null ? null : getGson().fromJson(objectList,new TypeToken<HashMap<String,String>>(){}.getType());
+    }
+
+    @TypeConverter
+    public static String latlngObjectToString(LatLng latlng) {
+        return latlng == null ? null : getGson().toJson(latlng);
+    }
+
+    @TypeConverter
+    public static LatLng stringToLatLng(String objectList) {
+        return objectList == null ? null : getGson().fromJson(objectList,LatLng.class);
+    }
+
+}