[Feature][dolphinscheduler-master] Add loop task

[1205747671]

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• I had searched in the issues and found no similar feature requirement.

Description

Add a loop task, such as executing the subsequent process multiple times in a loop. By using the loop task node, can conveniently call it multiple times. Currently, in order to implement this function, a new task script has to be added, which is implemented by calling the interface multiple times. This is very cumbersome.

Use case

Create a loop task, increase the number of loops, this number can be obtained from the previous task, and execute the subsequent process multiple times according to the number of loops.

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[jiaoew1991]

We have the same requirement, any progress ?

[zhongjiajie]

is this same or like dynamic task? https://dolphinscheduler.apache.org/en-us/docs/3.2.0/guide/task/dynamic

[sunVII]

is this same or like dynamic task? https://dolphinscheduler.apache.org/en-us/docs/3.2.0/guide/task/dynamic

I hope to generate a parameter list in a preprocessing task, then enter a loop task node to select the workflow that needs to be looped. During this process, choose to generate sub-workflow instances, either in serial or parallel, and determine the number of instances.