Add release workflow for trusted publishing

[ubaskota]

Issue #, if available:

Description of changes:
Adds a GitHub Actions workflow for publishing s3transfer to PyPI using trusted publishing (OIDC). This replaces credential-based publishing with a more secure, token-free approach where PyPI verifies the package origin directly through GitHub's OIDC identity.

Testing
Ran a test build and verified that a package was published to test.pypi as expected.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.68%. Comparing base (8647a30) to head (73c1ccd).
⚠️ Report is 35 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #401      +/-   ##
===========================================
+ Coverage    80.28%   81.68%   +1.40%     
===========================================
  Files           16       16              
  Lines         3013     3184     +171     
===========================================
+ Hits          2419     2601     +182     
+ Misses         594      583      -11     

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