Allow moderator to enter meeting without approval in lobby mode

muc_allow_moderator_enter_lobby.patch

Instruction
1. goto: cd /usr/share/jitsi-meet/prosody-plugins/
2. run: sudo patch -b </var/www/jitsi-meet/resources/prosody-plugins/muc_allow_moderator_enter_lobby.patch
3. You will see following:-
	patching file mod_muc_lobby_rooms.lua
	Hunk #1 succeeded at 1390 (offset 134 lines).
4. A backup file be saved in that same folder with named as mod_muc_lobby_rooms.lua.orig
==================================================================
--- mod_muc_lobby_rooms.lua	2021-09-16 11:43:45.425000000 +0530
+++ mod_muc_lobby_rooms.lua	2021-09-16 11:42:16.435872526 +0530
@@ -104,6 +104,25 @@
     broadcast_json_msg(room, actor, notify_json);
 end
 
+-- Check user is moderator or not.
+-- Return true if moderator else false
+function verify_occupant_is_moderator(origin)
+    local moderator = false;
+    local context_user = origin.jitsi_meet_context_user;
+    -- When the JWT payload having affiliation key with value owner/moderator/member
+    local jwt_affiliation = (context_user and context_user.affiliation) or '';
+    -- When the JWT payload having moderator key with value true or false
+    local jwt_moderator = (context_user and context_user.moderator) or '';
+
+    if jwt_affiliation == "owner" or jwt_affiliation == "moderator" then
+        moderator = true;
+    elseif jwt_moderator == true then
+        moderator = true;
+    end
+
+    return moderator;
+end
+
 function filter_stanza(stanza)
     if not stanza.attr or not stanza.attr.from or not main_muc_service then
         return stanza;
@@ -333,6 +352,10 @@
             whitelistJoin = true;
         end
 
+        if not whitelistJoin then
+            whitelistJoin = verify_occupant_is_moderator(event.origin);
+        end 
+
         if whitelistJoin then
             local affiliation = room:get_affiliation(invitee);
             if not affiliation or affiliation == 0 then