Introduce Credential structure to define auth type

For now we are planning to support Password and OAuthToken.
In the future, we would like to add certificate-based authentication.

_examples/xmpp_echo/xmpp_echo.go

@@ -17,7 +17,7 @@ func main() {
 	config := xmpp.Config{
 		Address:      "localhost:5222",
 		Jid:          "test@localhost",
-		Password:     "test",
+		Credential:   xmpp.Password("test"),
 		StreamLogger: os.Stdout,
 		Insecure:     true,
 		// TLSConfig: tls.Config{InsecureSkipVerify: true},

_examples/xmpp_jukebox/xmpp_jukebox.go

@@ -32,9 +32,9 @@ func main() {
 
 	// 2. Prepare XMPP client
 	config := xmpp.Config{
-		Address:  *address,
-		Jid:      *jid,
-		Password: *password,
+		Address:    *address,
+		Jid:        *jid,
+		Credential: xmpp.Password(*password),
 		// StreamLogger: os.Stdout,
 		Insecure: true,
 	}