refactor: enable strict type checking everywhere

[antfu]

🔗 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

This is the final PR to enable TS strictness, by enabling strict at top-level tsconfig.json and removing all the tsconfig.json in sub packages.

Blocked by unjs/untyped#45

📝 Checklist

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

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[pi0]

Released unjs/untyped#45 in 0.4.6. Update on main works but seems when we add type assertions, a regression happened to the loader. Still investigating to see what's going on. But two things we need to solve:

• Regression to the loader
• Probably a defineSchemaObject from untyped to remove the need for manual <InputObject> for $resolve typeing.

[pi0]

Schema is fine now. I will move new type to untyped and release in parallel. We have 41 new appear issues :D

[pi0]

Amazing work!