Integrate QA Assistant for mobile with event handling and refactoring

[Heihokon]

• Support forced variation allocation/unallocation in QA mode
• Add visitorVariationState initialization for both QA and non-QA modes
• Refactor BucketingManager targeting/operator evaluation logic
• Enhance ApiManager and campaign data structures (add campaign name)
• Add unit tests for mobile QA assistant modules
• Update version to 5.2.0 and fix README branding/links

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.45%. Comparing base (d631bba) to head (d5b645d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   99.42%   99.45%   +0.02%     
==========================================
  Files           7       10       +3     
  Lines         174      182       +8     
  Branches       34       35       +1     
==========================================
+ Hits          173      181       +8     
  Misses          1        1              

Flag	Coverage Δ
unittests	99.45% <100.00%> (+0.02%)	⬆️

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