DO NOT MERGE: Migrate SettingsActivity to fragment

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/res/layout/fragment_setting.xml

@@ -20,9 +20,11 @@
   -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical">
+    android:orientation="vertical"
+    tools:context=".view.ui.preferences.SettingsFragment">
 
     <include
         android:id="@+id/layout_toolbar_action"

app/src/main/res/navigation/mobile_navigation.xml

@@ -70,4 +70,9 @@
         android:name="com.aurora.store.view.ui.account.AccountFragment"
         android:label="@string/title_account_manager"
         tools:layout="@layout/fragment_account" />
+    <fragment
+        android:id="@+id/settingsFragment"
+        android:name="com.aurora.store.view.ui.preferences.SettingsFragment"
+        android:label="@string/title_settings"
+        tools:layout="@layout/fragment_setting" />
 </navigation>