fix(readRawBody): check req.rawBody before req.body

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

With readRawBody utility, we check req.body that can be provided from direct-fetch/unenv. (sadly) this conflicts with some runtimes (firebase) as I discovered which provides req.body as "parsed body".

Later we shall avoid depending on both and instead translate rawBody directly from higher-oder layers (user project or nitro preset entry for example) but this is a quick workaround for the situation.

📝 Checklist

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

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Latest commit:	52c0109
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (53703dc) 74.36% compared to head (52c0109) 74.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
+ Coverage   74.36%   74.65%   +0.28%     
==========================================
  Files          47       47              
  Lines        4245     4246       +1     
  Branches      565      574       +9     
==========================================
+ Hits         3157     3170      +13     
+ Misses       1073     1061      -12     
  Partials       15       15              

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