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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