[Feature] v2 workflow supports loop

[zhainanshidai]

MaxKB Version

v2

Please describe your needs or suggestions for improvements

v2工作流可以支持循环，就可以解锁很多场景了。

Please describe the solution you suggest

No response

Additional Information

No response

[baixin513]

感谢反馈，v2.2.0会支持，重复issue，先关闭

[shaohuzhang1]

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Thanks for the feedback, v2.2.0 will support it, repeat issue, close it first