Merge branch 'feat/type' into 'master'

feat: Add conversation type enum.

See merge request popc/serversdk/server-sdk-java!23

Author: zhangkailiang

src/main/java/io/rong/util/CodeUtil.java

@@ -16,14 +16,18 @@ public static enum ConversationType {
         DISCUSSION("2"),
         // Group chat
         GROUP("3"),
+	    // Chat room
+	    CHATROOM("4"),
         // System notification
         SYSTEM("6"),
         // Customer service chat
         KF("5"),
         // Application public service
         MC("7"),
         // Public service
-        MP("8");
+        MP("8"),
+	    // Ultra group chat
+	    ULTRA_GROUP("10");
 
 		private String name;