refactor(nuxt): do not add all composable auto-imports to globalThis

[danielroe]

🔗 Linked issue

❓ 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

globals is turned off by default, and I think we can keep the same behaviour as without it. Otherwise there's extra work done on initial build/warmup for all composables and I'm not sure of the benefit. (I think it is a hold-over from previous default behaviour.)

📝 Checklist

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

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[pi0]

global option was actually added to remove the parsing overhead (to detect usage in dev) but i think transform overhead of loading composable files should be more at least in a small sized project (we never benchmarked AFAIK)

Removing this option makes sense 👍🏼 Only i think we can consider this PR a refactor since is not changing any behavior?