[Feature Request] Add ThemeOptionAPI type

[Mister-Hope]

// theme-api.d.ts
export interface ThemeOptionAPI extends PluginOptionAPI{
  extend?: string;
}

[Mister-Hope]

If you think it's Okey I can create a pull request, or you can push a commit by yourself.

And if you want, I can help with adding some comment docs on vuepress-types for a better typescript experiense, based on the English version of Vuepress docs.

[lock[bot]]

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