Add a setting to hide unread messages badges. (#2412)

* Add a setting to hide grey unread messages badges.

* Move room badge logic to be built in the view model instead of in the view.

* Move setting into DeveloperOptions.

ElementX/Sources/Application/AppSettings.swift

@@ -38,6 +38,7 @@ final class AppSettings {
         case richTextEditorEnabled
         case appAppearance
         case sendReadReceiptsEnabled
+        case hideUnreadMessagesBadge
         
         case elementCallBaseURL
         case elementCallEncryptionEnabled
@@ -212,6 +213,11 @@ final class AppSettings {
     @UserPreference(key: UserDefaultsKeys.analyticsConsentState, defaultValue: AnalyticsConsentState.unknown, storageType: .userDefaults(store))
     var analyticsConsentState
     
+    // MARK: - Home Screen
+    
+    @UserPreference(key: UserDefaultsKeys.hideUnreadMessagesBadge, defaultValue: false, storageType: .userDefaults(store))
+    var hideUnreadMessagesBadge
+    
     // MARK: - Room Screen
     
     @UserPreference(key: UserDefaultsKeys.timelineStyle, defaultValue: TimelineStyle.bubbles, storageType: .userDefaults(store))