Generate completion script dynamic

[Zheaoli]

Feature Description

For now, we have a static template file for shell completion. But it does not work for the plugin and the script we define in the config file.

Problem and Solution

Maybe we can generate the completion file dynamic? just like we do in https://github.com/spf13/cobra/blob/main/completions.go

Additional Context

No response

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.