Recognize jitsi_participant_codecList as an xmpp extension.

Add VISITOR_CODECS to ConferenceProperties.

src/main/java/org/jitsi/xmpp/extensions/jitsimeet/ConferenceProperties.java

@@ -73,6 +73,12 @@ public class ConferenceProperties
      */
     public static final String KEY_VISITOR_COUNT = "visitor-count";
 
+    /**
+     * The property key used to indicate the set of video codecs supported by all visitors
+     * currently in the conference
+     */
+    public static final String KEY_VISITOR_CODECS = "visitor-codecs";
+
     /**
      * The property key used to signal support for session restart to the current conference.
      */

src/main/kotlin/org/jitsi/xmpp/extensions/jitsimeet/JitsiParticipantCodecList.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright @ 2023 - present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jitsi.xmpp.extensions.jitsimeet
+
+import org.jitsi.xmpp.extensions.AbstractPacketExtension
+
+class JitsiParticipantCodecList : AbstractPacketExtension(NAMESPACE, ELEMENT) {
+    var codecs: List<String>
+        get() = text?.lowercase()?.split(',') ?: emptyList()
+        set(value) {
+            text = value.joinToString(separator = ",").lowercase()
+        }
+
+    companion object {
+        const val ELEMENT = "jitsi_participant_codecList"
+        const val NAMESPACE = "jabber:client"
+    }
+}