[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

• [x] All new/changed/fixed functionality is covered by tests (or N/A)
• [x] 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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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