Enable Chat backup, Mentions and Read Receipt in release.

Also change default for debug to enabled, but keep `isFinished = false` for now, so that they are still disableable.

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

@@ -65,21 +65,21 @@ enum class FeatureFlags(
         key = "feature.mentions",
         title = "Mentions",
         description = "Type `@` to get mention suggestions and insert them",
-        defaultValue = false,
+        defaultValue = true,
         isFinished = false,
     ),
     SecureStorage(
         key = "feature.securestorage",
         title = "Chat backup",
         description = "Allow access to backup and restore chat history settings",
-        defaultValue = false,
+        defaultValue = true,
         isFinished = false,
     ),
     ReadReceipts(
         key = "feature.readreceipts",
         title = "Show read receipts",
         description = null,
-        defaultValue = false,
+        defaultValue = true,
         isFinished = false,
     ),
 }

libraries/featureflag/impl/src/main/kotlin/io/element/android/libraries/featureflag/impl/StaticFeatureFlagProvider.kt

@@ -39,9 +39,9 @@ class StaticFeatureFlagProvider @Inject constructor() :
                 FeatureFlags.NotificationSettings -> true
                 FeatureFlags.VoiceMessages -> true
                 FeatureFlags.PinUnlock -> true
-                FeatureFlags.Mentions -> false
-                FeatureFlags.SecureStorage -> false
-                FeatureFlags.ReadReceipts -> false
+                FeatureFlags.Mentions -> true
+                FeatureFlags.SecureStorage -> true
+                FeatureFlags.ReadReceipts -> true
             }
         } else {
             false