feat(netlify): incremental static regeneration + swr

[danielroe]

🔗 Linked issue

resolves #93

❓ 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 PR adapts the netlify preset to support the swr/static route rule for dynamic on-demand builder configuration.

For example, the following config would use builder functions only for the blog & articles routes. The blog routes would be generated only once and then persisted; the articles routes would be regenerated every 360 seconds.

export default defineNitroConfig({
  routes: {
    '/blog/**': { static: true },
    '/articles/**': { swr: 360 }
  }
})

Here's a deployment using this PR: https://main--melodious-klepon-3a2ccb.netlify.app

Note: we pass the value of swr directly through to ttl but it is expressed in the Netlify docs in seconds and we should likely specify what the number means - e.g. seconds or milliseconds, etc.

📝 Checklist

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

[codecov]

Codecov Report

Merging #540 (9ad970f) into main (1026edb) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
+ Coverage   66.04%   66.09%   +0.05%     
==========================================
  Files          55       55              
  Lines        4049     4056       +7     
  Branches      437      438       +1     
==========================================
+ Hits         2674     2681       +7     
  Misses       1371     1371              
  Partials        4        4              

Impacted Files	Coverage Δ
src/presets/netlify.ts	56.33% <100.00%> (+1.92%)	⬆️
src/types/nitro.ts	100.00% <100.00%> (ø)

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[atinux]

I believe seconds makes more sense personally :)