feat: Adds wait for host prosody module and handling it.

While the host arrives all other participants are waiting in lobby and once the host arrives lobby is destroyed and the participants join the call.
Adds reading some other fields in jwt to extract email.
Introduces tokenLogoutUrl to be used for logout.

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

@@ -297,6 +297,9 @@ function Util:process_and_verify_token(session, acceptedIssuers)
           if claims["context"]["room"] ~= nil then
             session.jitsi_meet_context_room = claims["context"]["room"]
           end
+        elseif claims["user_id"] then
+          session.jitsi_meet_context_user = {};
+          session.jitsi_meet_context_user.id = claims["user_id"];
         end
         return true;
     else