PubSub protocol support

Added support for :
- XEP-0050   (Command))
- XEP-0060   (PubSub)
- XEP-0004   (Forms)

Fixed the NewClient function by adding parsing of the domain from the JID if no domain is provided in transport config.
Updated xmpp_jukebox example

cmd/fluuxmpp/send.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"gosrc.io/xmpp/stanza"
 	"os"
 	"strings"
 	"sync"
@@ -48,7 +49,7 @@ func sendxmpp(cmd *cobra.Command, args []string) {
 	wg.Add(1)
 
 	// FIXME: Remove global variables
-	var mucsToLeave []*xmpp.Jid
+	var mucsToLeave []*stanza.Jid
 
 	cm := xmpp.NewStreamManager(client, func(c xmpp.Sender) {
 		defer wg.Done()
@@ -57,7 +58,7 @@ func sendxmpp(cmd *cobra.Command, args []string) {
 
 		if isMUCRecipient {
 			for _, muc := range receiver {
-				jid, err := xmpp.NewJid(muc)
+				jid, err := stanza.NewJid(muc)
 				if err != nil {
 					log.WithField("muc", muc).Errorf("skipping invalid muc jid: %w", err)
 					continue

cmd/fluuxmpp/xmppmuc.go

@@ -7,7 +7,7 @@ import (
 	"gosrc.io/xmpp/stanza"
 )
 
-func joinMUC(c xmpp.Sender, toJID *xmpp.Jid) error {
+func joinMUC(c xmpp.Sender, toJID *stanza.Jid) error {
 	return c.Send(stanza.Presence{Attrs: stanza.Attrs{To: toJID.Full()},
 		Extensions: []stanza.PresExtension{
 			stanza.MucPresence{
@@ -16,7 +16,7 @@ func joinMUC(c xmpp.Sender, toJID *xmpp.Jid) error {
 	})
 }
 
-func leaveMUCs(c xmpp.Sender, mucsToLeave []*xmpp.Jid) {
+func leaveMUCs(c xmpp.Sender, mucsToLeave []*stanza.Jid) {
 	for _, muc := range mucsToLeave {
 		if err := c.Send(stanza.Presence{Attrs: stanza.Attrs{
 			To:   muc.Full(),