refactor(nuxt3): cleanup data fetching and improved useAsyncData

[pi0]

🔗 Linked issue

nuxt/nuxt#11860

❓ Type of change

• Documentation (updates to the documentation or readme)
• Bug fix (a non-breaking change that fixes an issue)
• Enhancement (improving an existing functionality like performance)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

• Remove experimental useData, useHydration and useSSRRef implementations
• Inline internal utils:useGlobalData, ensureReactive
• Merge asyncData into useAsyncData with simple interface and auto caching when used more than once per instance

Improvements on asyncData:

• Main util renamed to useAsyncData
• Reuse same instance when used than once
• Use ref for data as it is so common an API returning non object (String, Array)
• Reactive error
• Support default() option
• Rename fetch to refrash to avoid shadowing native fetch keyword

Generic:

• Early init nuxt.payload object before plugin execution

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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