test-suite - feat (breaking) overhaul based on v6 changes

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
test-suite - feat (breaking) overhaul based on v6 changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4bdd3db) to head (dfe1861).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #1931    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           43        52     +9     
  Lines         4177      4478   +301     
  Branches       667       668     +1     
==========================================
+ Hits          4177      4478   +301     

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[chatgpt-codex-connector]

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[gemini-code-assist]

Code Review

This pull request refactors the @keyv/test-suite package to introduce a modular and type-safe architecture, including a new storageTestSuite for direct adapter testing and enhanced JSDoc documentation. Across the repository, tests have been updated to align with the new suite structure and a consistent vitest API. The review feedback focuses on improving the robustness of iterator tests by ensuring assertions verify the complete set of yielded items—including collection size and value accuracy—to prevent false positives from empty or incomplete iterations.