fix: fix type hints of EvaluationContext and HookHints

[gruebel]

This PR

• fixed type hints for both EvaluationContext and HookHints
• also added typechecking tests for both positive/negative cases

Related Issues

Relates #534

[gemini-code-assist]

Summary of Changes

Hello @gruebel, 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 focuses on enhancing the type safety and maintainability of the codebase by refining the type definitions for EvaluationContext and HookHints. The changes ensure that these critical components adhere strictly to their specified structures, and a new suite of typechecking tests has been added to prevent future type-related issues and validate the current improvements.

Highlights

• Type Hint Refinement: The type hints for EvaluationContext and HookHints have been updated to accurately reflect the OpenFeature specification, improving type safety and clarity for these core data structures.
• New Typechecking Tests: A new dedicated tests/typechecking directory has been introduced, containing comprehensive static analysis tests for both positive and negative scenarios to validate the correctness of the updated type hints for EvaluationContext and HookHints.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.86%. Comparing base (b418cb0) to head (d270603).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #535   +/-   ##
=======================================
  Coverage   97.85%   97.86%           
=======================================
  Files          39       39           
  Lines        1822     1823    +1     
=======================================
+ Hits         1783     1784    +1     
  Misses         39       39           

Flag	Coverage Δ
unittests	97.86% <100.00%> (+<0.01%)	⬆️

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[gemini-code-assist]

Code Review

This pull request correctly fixes the recursive type hints for EvaluationContext and HookHints to be more accurate and align better with standard practices for defining such structures. The addition of type-checking tests is an excellent way to validate these complex types and prevent future regressions. My review includes a suggestion to deduplicate the now-identical type definitions to improve maintainability. I also noticed that HookData has a similar type-hint issue and have provided feedback on how to address that, although it might be best handled as a separate breaking change.