Provide a JSON file on the vendored libraries in vite plus

[huang-julien]

Description

Hi 👋

Currently, vitest is being vendored by vite-plus. Third party tools canno't really retrieve the version being vendored by vite-plus.
Some needs to do this for compatibility check with tools being aliased by vite-plus

Suggested solution

have vendored tools provide a json, could be a copy of the package.json from the bundled tool so third party libraries can do

import { versions } from 'vite-plus'
// or
import { version} from 'vite-plus/test'

Alternative

No response

Additional context

No response

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.