Fix typing

[youtux]

Fix many mypy issues.
Notably, I replace private attributes like __scenario__, __scenario_report__, etc. with registries (WeakKeyDictionary). E.g.

# Old way

# setting value
scenario_wrapper.__scenario__ = scenario

# getting value
scenario = getattr(obj, "__scenario__", None)


# New way
# setting value
scenario_wrapper_template_registry[scenario_wrapper] = scenario

# getting value
scenario = scenario_wrapper_template_registry.get(scenario_wrapper)

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8a694ff) 95.58% compared to head (51c2173) 95.49%.

Files	Patch %	Lines
src/pytest_bdd/generation.py	50.00%	1 Missing and 2 partials ⚠️
tests/feature/test_report.py	81.25%	3 Missing ⚠️
src/pytest_bdd/utils.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #658      +/-   ##
==========================================
- Coverage   95.58%   95.49%   -0.09%     
==========================================
  Files          49       49              
  Lines        1788     1819      +31     
  Branches      193      195       +2     
==========================================
+ Hits         1709     1737      +28     
- Misses         52       54       +2     
- Partials       27       28       +1     

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[sourcery-ai]

PR Type: Refactoring

PR Summary: The pull request introduces a refactoring that replaces private attributes with WeakKeyDictionary registries to manage scenarios and reports within the pytest_bdd framework. This change aims to fix typing issues and improve the handling of object lifecycles by avoiding strong reference cycles that can lead to memory leaks.

Decision: Comment

📝 Type: 'Refactoring' - not supported yet.

• Sourcery currently only approves 'Typo fix' PRs.

✅ Issue addressed: this change correctly addresses the issue or implements the desired feature.

No details provided.

📝 Complexity: the changes are too large or complex for Sourcery to approve.

• Unsupported files: the diff contains files that Sourcery does not currently support during reviews.

General suggestions:

• Ensure that the new registry-based approach is thoroughly tested, especially in scenarios with complex fixture setups and teardowns.
• Consider adding inline comments explaining the choice of WeakKeyDictionary for future maintainers.
• Review the changes to ensure that all references to the old attribute-based approach have been properly updated to the new registry-based approach.

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