[GH-380] - Add User Refresh Token Management Functionality to SDK

[developerkunal]

🔧 Changes

• Add GetRefreshTokens function to retrieve details for a user's refresh tokens.
• Add DeleteRefreshTokens function to delete all refresh tokens for a user.
• Update Go version from 1.21.9 to 1.21 to ensure compatibility with govulncheck-action and utilize the automatic version detection feature.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (aa8d96b) to head (e73fffd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
+ Coverage   95.34%   95.37%   +0.03%     
==========================================
  Files          47       47              
  Lines        7558     7610      +52     
==========================================
+ Hits         7206     7258      +52     
  Misses        235      235              
  Partials      117      117              

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