perf: favor importing generated options over passing as argument

[BobbieGoede]

🔗 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

Instead of passing the generated nuxtI18nOptions as arguments, I instead import nuxtI18nOptions when needed or only pass the relevant properties instead of the full object.

Since most of the memory leaks so far have been related to the generated options, and we probably shouldn't mutate the generated options, this may reduce memory usage and reduce the odds of keeping a reference to the entire object in a closure. Maybe we could consider freezing the generated options to prevent any mutations, something to look into another time.

📝 Checklist

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

[kazupon]

Great work! ❤️
Thanks!