Support group_id transfer of ddl task with serlize_message

src/rootserver/ddl_task/ob_drop_index_task.cpp

@@ -41,6 +41,7 @@ int ObDropIndexTask::init(
     const uint64_t index_table_id,
     const int64_t schema_version,
     const int64_t parent_task_id,
+    const int64_t consumer_group_id,
     const obrpc::ObDropIndexArg &drop_index_arg)
 {
   int ret = OB_SUCCESS;
@@ -61,6 +62,7 @@ int ObDropIndexTask::init(
     schema_version_ = schema_version;
     task_id_ = task_id;
     parent_task_id_ = parent_task_id;
+    consumer_group_id_ = consumer_group_id;
     task_version_ = OB_DROP_INDEX_TASK_VERSION;
     is_inited_ = true;
     ddl_tracing_.open();