Fix issue #465. Added tests and adjusted logic to get more complete test coverage

[kamikkels]

Added more TimSorterTests tests and changed method names for clarity.
Added tests in HashTableTests for collision handling and resizing behavior.
Improved null handling in HashTable methods and adjusted resizing logic.

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[Copilot]

Pull Request Overview

This PR fixes issue #465 by enhancing test coverage and improving code clarity in the HashTable and TimSorter implementations. The changes focus on adding comprehensive tests for collision handling, resizing behavior, and edge cases while modernizing the codebase with C# language features.

• Added extensive test coverage for HashTable collision handling, resizing logic, and edge cases
• Modernized TimSorter and related classes with primary constructors and improved null handling
• Simplified HashTable implementation by removing version tracking and consolidating null checks

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
DataStructures/Hashing/HashTable.cs	Simplified null checks using default keyword, removed version tracking, and improved resizing logic
DataStructures.Tests/Hashing/HashTableTests.cs	Added comprehensive tests for collision handling, resizing behavior, and edge cases
Algorithms/Sorters/Comparison/TimSorterSettings.cs	Modernized with primary constructor pattern
Algorithms/Sorters/Comparison/TimSorter.cs	Added null validation and improved documentation
Algorithms.Tests/Sorters/Comparison/TimSorterTests.cs	Enhanced test coverage with clearer naming and additional edge case tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.14%. Comparing base (a985c67) to head (ae68363).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #530      +/-   ##
==========================================
- Coverage   95.15%   95.14%   -0.01%     
==========================================
  Files         272      272              
  Lines       10875    10862      -13     
  Branches     1529     1530       +1     
==========================================
- Hits        10348    10335      -13     
  Misses        400      400              
  Partials      127      127              

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[siriak]

Looks good, thanks! I'll keep the issue open for a while to see if the issue appears again or it is resolved completely