TS support for @vue/compat usage with vue3/optionsApi

[beckerin]

Documentation issue

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Additional context or description

This *.d.ts is not giving the right support to TypeScript when used with vue3/optionsApi.
Giving errors and not giving right structure functions path.

This example runs based on https://stackblitz.com/edit/bootstrap-vue-with-compat?file=main.js
This issues does not break the code ( it works besides errors on lint ) , is just a developer friendly support.

[beckerin]

#7178