chore: Fix logging enum serialization

[hjgraca]

Please provide the issue number

Issue number: #656

Summary

Changes

Serialize enum types correctly.
Add specific JsonConverter for LogLevel

User experience

Please share what the user experience looks like before and after this change

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.48%. Comparing base (5eb8338) to head (c8684e8).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ogging/Internal/Helpers/PowertoolsLoggerHelpers.cs	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #670      +/-   ##
===========================================
+ Coverage    73.43%   73.48%   +0.04%     
===========================================
  Files          196      197       +1     
  Lines         8027     8043      +16     
  Branches       857      860       +3     
===========================================
+ Hits          5895     5910      +15     
- Misses        1846     1847       +1     
  Partials       286      286              

Flag	Coverage Δ
unittests	73.48% <90.47%> (+0.04%)	⬆️

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud