[Feature request] Export devtool related config

[Mister-Hope]

Clear and concise description of the problem

See vuepress/ecosystem@42a3474

Suggested solution

Export these configurations so that downstream plugin can never break, i.e.:

export const INSPECTOR_ID = 'org.vuejs.vuepress'
export const INSPECTOR_LABEL = 'VuePress'

Also I would suggest regrouping these things.

Before:

Client Data:
  layouts
  pageData
  pageComponent
  pageFrontmatter
  pageHead
  pageHeadTitle
  pageLang
  pageLayout
  redirects
  routeLocale
  routePath
  routes
  siteData
  siteLocaleData

After:

Site Data:
  siteData
  siteLocaleData
  layouts

Routes:
  routes
  redirects
  routePath
  routeLocale

Page Data:
  pageData
  pageComponent
  pageFrontmatter
  pageHead
  pageHeadTitle
  pageLang
  pageLayout

Alternative

No response

Additional context

No response

[github-actions]

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