Fix race conditions in mock methods and mock properties

[graycampbell]

📝 Summary

• Updated all the mock method and mock property backing types to read and write data directly to their private, locked properties instead of to the locked properties' public-facing wrappers to prevent race conditions.
• Updated unit tests to validate that the race conditions are no longer possible.

🛠️ Type of Change

• Bug fix (change that fixes an issue)
• New feature (change that adds functionality)
• Breaking change (bug fix or feature that is not backwards compatible)
• Documentation (DocC, API docs, markdown files, templates, etc.)
• Testing (new tests, updated tests, etc.)
• Refactoring or code formatting (no logic changes)
• Updating dependencies (Swift packages, Homebrew, etc.)
• CI/CD (change to automated workflows)
• Chore (other maintenance)

🧪 How Has This Been Tested?

• Updated unit tests to validate that the race conditions are no longer possible by using a barrier to force concurrent execution across tasks.
• Added new unit tests.

🔗 Related PRs or Issues

• Fixes [Bug] Mock doesn't record every invocation when invoked simultaneously across threads #121

✅ Checklist

• I have added relevant tests
• I have verified all tests pass
• I have formatted my code using SwiftFormat
• I have updated documentation (if needed)
• I have added the appropriate label to my PR
• I have read the contributing guidelines
• I agree to follow this project's Code of Conduct

[codecov]

Codecov Report

❌ Patch coverage is 77.87611% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.65%. Comparing base (27a14fa) to head (fe19537).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...kPropertyAsyncGetter/MockPropertyAsyncGetter.swift	0.00%	15 Missing ⚠️
...rowingGetter/MockPropertyAsyncThrowingGetter.swift	0.00%	15 Missing ⚠️
...essors/MockPropertyGetter/MockPropertyGetter.swift	0.00%	15 Missing ⚠️
...essors/MockPropertySetter/MockPropertySetter.swift	0.00%	15 Missing ⚠️
...rtyThrowingGetter/MockPropertyThrowingGetter.swift	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   69.24%   69.65%   +0.40%     
==========================================
  Files          73       73              
  Lines        4585     4811     +226     
==========================================
+ Hits         3175     3351     +176     
- Misses       1410     1460      +50     

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[graycampbell]

In regards to the Codecov Report, I didn't add any new tests in this PR. It's already a very big PR, so I decided to only update existing tests. I will add new tests for all the mock property accessors in a separate PR later this week.

[pjtnt11]

Some things I think we can improve but otherwise looks good ✅