feat: Several module optimizations to avoid constant parsing of jids. (#12594)

* feat: Several module optimizations to avoid constant parsing of jids.

Caches the parsed values in a rotating table with limited size.
Skips constant creating of a stanza with never changing values - create it once and then just clone it.

* squash: Fixes extract_subdomain multiple values.

* squash: Fix table values when there is a nil element.

* squash: Fix skipping the roomless IQs.

* squash: Fix comments.

resources/prosody-plugins/token/util.lib.lua

@@ -273,9 +273,7 @@ end
 --         and was not successful
 function Util:verify_room(session, room_address)
     if self.allowEmptyToken and session.auth_token == nil then
-        module:log(
-            "debug",
-            "Skipped room token verification - empty tokens are allowed");
+        --module:log("debug", "Skipped room token verification - empty tokens are allowed");
         return true;
     end