fix: Handle boolean fields returned as strings

[kailash-b]

Changes

This PR adds a BooleanStringConverter to handle boolean fields that the Auth0 server may return as JSON strings (e.g., "true"/"false") instead of native JSON booleans.

• Classes added:

  • BooleanStringConverter (src/Auth0.ManagementApi/Core/BooleanStringConverter.cs) - a JsonConverter<bool> that handles deserialization of both native JSON booleans and string-encoded booleans ("true", "false", case-insensitive). Serialization always writes native JSON booleans.

• Classes modified:

  • JsonConfiguration (src/Auth0.ManagementApi/Core/JsonConfiguration.cs) - registered the new converter globally in JsonOptions.

• Other:

  • Updated .fernignore to preserve the new converter and its tests from Fern code generation.

References

Testing

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[codecov]

Codecov Report

❌ Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.36%. Comparing base (88ea2e6) to head (09b69fd).

Files with missing lines	Patch %	Lines
...Auth0.ManagementApi/Core/BooleanStringConverter.cs	80.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1015      +/-   ##
==========================================
+ Coverage   31.35%   31.36%   +0.01%     
==========================================
  Files        2709     2710       +1     
  Lines      107737   107753      +16     
  Branches     6328     6330       +2     
==========================================
+ Hits        33782    33799      +17     
+ Misses      72185    72184       -1     
  Partials     1770     1770              

Flag	Coverage Δ
authIntTests	2.98% <62.50%> (+<0.01%)	⬆️
mgmtIntTests	30.09% <81.25%> (+0.01%)	⬆️
unittests	0.31% <0.00%> (-0.01%)	⬇️

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