[JES] Add a limit on the get_discussion call to only return at most 2000...

[JES] Add a limit on the get_discussion call to only return at most 2000 posts/comments. There are some posts with thousands of children, and requesting those posts tends to cause the hivemind server to hang while executing a large query. This should prevent that

hive/server/bridge_api/thread.py

@@ -45,6 +45,7 @@ async def get_discussion(context, author, permlink, observer=None):
                             INNER JOIN hive_post_data hpd ON hpd.id = hive_posts.id
                             INNER JOIN hive_category_data hcd ON hcd.id = hp.category_id
                             WHERE NOT hive_posts.is_deleted AND NOT hive_posts.is_muted
+        LIMIT 2000
     """
 
     blacklists_for_user = None