feat: Add toggle to mute notifications from chat groups

assets/l10n/intl_en.arb

@@ -711,6 +711,16 @@
         "type": "text",
         "placeholders": {}
     },
+"allRooms": "All Group Chats",
+    "@allRooms": {
+        "type": "text",
+        "placeholders": {}
+    },
+    "discover": "Discover",
+    "@discover": {
+        "type": "text",
+        "placeholders": {}
+    },
     "displaynameHasBeenChanged": "Displayname has been changed",
     "@displaynameHasBeenChanged": {
         "type": "text",

lib/pages/settings_notifications/settings_notifications.dart

@@ -15,6 +15,12 @@ class NotificationSettingsItem {
   final String Function(BuildContext) title;
   const NotificationSettingsItem(this.type, this.key, this.title);
   static List<NotificationSettingsItem> items = [
+    NotificationSettingsItem(
+      PushRuleKind.underride,
+      '.m.rule.message',
+      (c) => L10n.of(c)!.allRooms,
+    ),
+ 
     NotificationSettingsItem(
       PushRuleKind.underride,
       '.m.rule.room_one_to_one',