Implement panic recovery for resilience (issue-17)

[cinar]

Pull Request

Description

• Added WithPanicRecovery functional option to enable panic handling.
• Introduced PanicError to encapsulate recovered panic values and stack traces.
• Modified execution logic to treat recovered panics as retryable errors.
• Added comprehensive unit tests for sequential and hedged execution.

Fixes #17

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.61%. Comparing base (075df51) to head (e797161).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
retry.go	69.23%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   93.30%   92.61%   -0.69%     
==========================================
  Files           8        8              
  Lines         433      447      +14     
==========================================
+ Hits          404      414      +10     
- Misses         21       24       +3     
- Partials        8        9       +1     

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