Shell completion support for `vp run` command

[Perdolique]

Description

Currently, I need to run vp run without additional params to see all available commands in the package.json file.

Having vp run TAB for scripts in the package.json file would be nice to have.

Additional context

Related to #950

Validations

• Read the Contributing Guidelines.
• Confirm this request is for Vite+ itself and not for Vite, Vitest, tsdown, Rolldown, or Oxc.
• Check that there isn't already an issue requesting the same feature.