Add support for predictive back gesture (#105)

Reference: https://developer.android.com/guide/navigation/predictive-back-gesture#opt-predictive

manager/app/src/main/AndroidManifest.xml

@@ -11,6 +11,7 @@
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
+        android:enableOnBackInvokedCallback="true"
         android:extractNativeLibs="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"