streams: Add can_resolve_topics_group setting.

Fixes #19955.

zerver/models/streams.py

@@ -157,6 +157,9 @@ class Stream(models.Model):
         UserGroup, on_delete=models.RESTRICT, related_name="+"
     )
     can_subscribe_group = models.ForeignKey(UserGroup, on_delete=models.RESTRICT, related_name="+")
+    can_resolve_topics_group = models.ForeignKey(
+        UserGroup, on_delete=models.RESTRICT, related_name="+"
+    )
 
     # The very first message ID in the stream.  Used to help clients
     # determine whether they might need to display "show all topics" for a
@@ -206,6 +209,11 @@ class Stream(models.Model):
             allow_everyone_group=False,
             default_group_name=SystemGroups.NOBODY,
         ),
+        "can_resolve_topics_group": GroupPermissionSetting(
+            allow_nobody_group=True,
+            allow_everyone_group=True,
+            default_group_name=SystemGroups.NOBODY,
+        ),
     }
 
     stream_permission_group_settings_requiring_content_access = [
@@ -272,6 +280,7 @@ class Stream(models.Model):
         "can_send_message_group_id",
         "can_remove_subscribers_group_id",
         "can_subscribe_group_id",
+        "can_resolve_topics_group_id",
         "is_recently_active",
         "topics_policy",
     ]