fix: mimic the behavior of stdlib StrEnum.__str__ in backport

[federicobond]

Copies the behavior of Python 3.11+ StrEnum by implementing __str__.

This is to ensure the value of str(Reason.DEFAULT) or str(ErrorCode.GENERAL) remains the same regardless of Python version.

[gemini-code-assist]

Summary of Changes

Hello @federicobond, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request standardizes the string conversion behavior for StrEnum instances by implementing the __str__ method in the backported StrEnum class. The primary goal is to ensure that str(enum_member) consistently returns the enum member's value, aligning with Python 3.11+ behavior and providing a uniform experience regardless of the Python runtime version. This change is supported by new tests confirming the expected string output for relevant enum types.

Highlights

• StrEnum Backport Enhancement: The StrEnum backport for Python versions prior to 3.11 now includes an explicit __str__ method. This change ensures that calling str() on a StrEnum member consistently returns its value attribute, mirroring the behavior of the standard library's StrEnum in Python 3.11 and later.
• Consistent String Representation: This modification guarantees that the string representation of StrEnum instances, such as Reason.DEFAULT or ErrorCode.GENERAL, remains uniform across different Python versions, preventing potential inconsistencies in applications that rely on these string conversions.
• New Test Coverage: New unit tests have been added to verify the correct __str__ behavior for ErrorCode and Reason enums, ensuring the intended functionality is maintained.

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[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.84%. Comparing base (8fdd784) to head (5588df0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
openfeature/_backports/strenum.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
- Coverage   97.89%   97.84%   -0.05%     
==========================================
  Files          39       40       +1     
  Lines        1849     1855       +6     
==========================================
+ Hits         1810     1815       +5     
- Misses         39       40       +1     

Flag	Coverage Δ
unittests	97.84% <71.42%> (-0.05%)	⬇️

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[gemini-code-assist]

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[aepfli]

/Gemini review

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