[Feature] Hope to add a global variable assignment component

[cjc1108]

MaxKB Version

v1.10.8-lts

Please describe your needs or suggestions for improvements

目前的变量赋值只在单个工作流中有效，希望增加一个赋值后，在后续对话也能使用的组件，这样在涉及到多次问答的场景时，这个变量可以保持赋值后的数，不用每次提问都得重新赋值，增加麻烦

Please describe the solution you suggest

No response

Additional Information

No response

[baixin513]

感谢反馈，后续版本考虑一下

[shaohuzhang1]

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Thanks for the feedback, consider the subsequent version