Add support for nuxt.schema in Nuxt configuration

[arashsheyda]

Clear and concise description of the problem

currently when we create a nuxt.schema file, it is not nested.

Suggested solution

can we add nuxt.schema under nuxt.config (or maybe app.vue, because of app.config?)

Alternative

No response

Additional context

• I would be happy to help

Validations

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• Read the Contributing Guide.
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