Vue 3 support for TypeScript Vue Apollo

**Is your feature request related to a problem? Please describe.**

Currently, the [TypeScript Vue Apollo](https://graphql-code-generator.com/docs/plugins/typescript-vue-apollo) imports [@vue/composition-api](https://github.com/vuejs/composition-api) which is a plugin to make the new Vue 3 composition API backward-compatible with Vue 2.

**Describe the solution you'd like**

This import is no longer needed with Vue 3, as the Composition API is now part of Vue itself.

I would like to see support for Vue 3, maybe with a new configuration parameter. I'm not sure if other changes besides changing this import are needed.

**Additional context**

Vue Appollo itself is being reworked for Vue 3: https://v4.apollo.vuejs.org/