Add upload and download fuzz corpus to the fuzzing ci

[pnoltes]

This PR introduces storage for the fuzz testing corpus using GitHub build artifacts.

Proposed Workflow

• Upload: The fuzz testing corpus artifact is uploaded only when building on the master branch.
• Usage: All other branches pull and use the latest corpus artifact from the master branch during their runs.

Feedback Requested

I’m looking for input on whether this is the optimal approach, specifically regarding:

1. GitHub Artifacts: Is using build artifacts the right storage mechanism for this, or should we look into alternatives?
2. Branch Strategy: Is using the master branch corpus for all other branches the correct way to handle seed data?
   • The Logic: The idea behind using the master corpora as a seed is to ensure branches have a more deterministic build. By doing this, the corpora only changes when the master branch itself is updated, preventing noise from fluctuating seeds on feature branches.

Any thoughts or suggestions on this setup are welcome!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.45%. Comparing base (effe33a) to head (f76aeb1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
- Coverage   91.50%   91.45%   -0.05%     
==========================================
  Files         235      235              
  Lines       28686    28686              
==========================================
- Hits        26248    26234      -14     
- Misses       2438     2452      +14     

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