refactor!: rename options autoImport to imports

[antfu]

🔗 Linked issue

nuxt/framework#6864

❓ 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

See nuxt/framework#6864

📝 Checklist

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

[codecov]

Codecov Report

Merging #433 (039d9d2) into main (1d02d01) will decrease coverage by 2.72%.
The diff coverage is 29.41%.

@@ Coverage Diff @@## main #433 +/- ##
==========================================
- Coverage 56.21% 53.48% -2.73% 
==========================================
Files 54 54 Lines 3467 3468 +1 Branches 366 368 +2 ==========================================
- Hits 1949 1855 -94 - Misses 1165 1258 +93 - Partials 353 355 +2 

Impacted Files	Coverage Δ
src/types/nitro.ts	100.00% <ø> (ø)
src/options.ts	42.59% <7.69%> (-44.33%)	⬇️
src/nitro.ts	79.22% <100.00%> (ø)
src/rollup/config.ts	80.78% <100.00%> (ø)
src/build.ts	48.76% <0.00%> (+0.20%)	⬆️

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