public String getInstanceClass() {
        TaskTypeEnum taskType = TaskTypeEnum.getTaskType(getInt(TASK_TYPE, TaskTypeEnum.FILE.getType()));
        return getInstanceClassByTaskType(taskType);
    }
parse json string to configuration instance.

@return job configuration
inlong-agent/agent-common/src/main/java/org/apache/inlong/agent/conf/InstanceProfile.java