[improve] Avoid each time no change submit will create a new version

Currently, each time submit code from python api to dolphinscheduler, a new version will be add even though do not change any task, workflow, and relation. It is better to find a way check whether there are any models change to judge add version or not

未指定文件或测试。首先追踪 Python API 的 submit 路径，以及 task、workflow 和 relation 模型是如何进行比较或持久化的；完成标准是提交未发生变化的定义不会创建新版本，而模型发生变化时仍会创建新版本。

由索引模型根据 Issue 内容生成。