Add room notification settings (#807)

* Add room notification settings

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>
Co-authored-by: Jorge Martín <jorgem@element.io>
Co-authored-by: Benoit Marty <benoit@matrix.org>
Co-authored-by: David Langley <langley.dave@gmail.com>

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -30,5 +30,11 @@ enum class FeatureFlags(
         key = "feature.polls",
         title = "Polls",
         description = "Create poll and render poll events in the timeline",
+        defaultValue = false,
+    ),
+    NotificationSettings(
+        key = "feature.notificationsettings",
+        title = "Show notification settings",
+        defaultValue = false,
     ),
 }