✨ Support null-proto in record

[dubzzz]

For now, users will have to explicitly ask for it. But in the next major, the null-prototype will be the default.

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• ⚡️ Improve performance
• Other(s): ...

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

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@fast-check/examples	Configuration

[codecov]

Codecov Report

Merging #4205 (4dac2e5) into main (8527ae6) will increase coverage by 0.02%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4205      +/-   ##
==========================================
+ Coverage   94.68%   94.71%   +0.02%     
==========================================
  Files         211      210       -1     
  Lines        5947     5958      +11     
  Branches     1365     1370       +5     
==========================================
+ Hits         5631     5643      +12     
+ Misses        300      299       -1     
  Partials       16       16              

Flag	Coverage Δ
unit-tests	94.71% <100.00%> (+0.02%)	⬆️
unit-tests-16.x-Linux	?
unit-tests-18.x-Linux	?
unit-tests-latest-Linux	94.71% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...nternals/builders/PartialRecordArbitraryBuilder.ts	100.00% <100.00%> (ø)
...internals/mappers/ValuesAndSeparateKeysToObject.ts	97.56% <100.00%> (+0.19%)	⬆️
packages/fast-check/src/arbitrary/record.ts	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes