Convert datetime error message to human friendly message

[yohanvalencia]

Change Summary

datetime.timedelta error message is now display in a 'human friendly' manner.

Related issue number

fix #882

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @dmontagu

[codspeed-hq]

CodSpeed Performance Report

Merging #915 will not alter performance

_{Comparing yvalencia91:improve-human-readability-timedelta-validation (adef21f) with main (7f7d03d)}

Summary

✅ 138 untouched benchmarks

[codecov]

Codecov Report

Merging #915 (adef21f) into main (7f7d03d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
+ Coverage   93.78%   93.79%   +0.01%     
==========================================
  Files         105      105              
  Lines       15331    15364      +33     
  Branches       25       25              
==========================================
+ Hits        14378    14411      +33     
  Misses        947      947              
  Partials        6        6              

Files Changed	Coverage Δ
src/validators/timedelta.rs	100.00% <100.00%> (ø)

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[yohanvalencia]

Please review

[adriangb]

Looks great to me!