Add feature flag for room alias suggestions, disabled by default.

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

@@ -72,6 +72,13 @@ enum class FeatureFlags(
         defaultValue = { true },
         isFinished = false,
     ),
+    RoomAliasSuggestions(
+        key = "feature.roomAliasSuggestions",
+        title = "Room alias suggestions",
+        description = "Type `#` to get room alias suggestions and insert them",
+        defaultValue = { false },
+        isFinished = false,
+    ),
     MarkAsUnread(
         key = "feature.markAsUnread",
         title = "Mark as unread",