feat(nuxt): make <NuxtPage> exposes default slots

[Mini-ghost]

🔗 Linked issue

Resolve #26998

📚 Description

After this PR, we can use <NuxtPage> more like <RouterView> like bellow:

<NuxtPage v-slot="{ Component: component }">
  <Component :is="component" />
</NuxtPage>

The code above is equivalent to using <NuxtPage /> without the slot, but the slot provides extra flexibility when we want to work with other features.

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