Skip iat verification and improve logging for authentication token verification

Duggan, Johnrequested to merge
58-add-debug-logging-when-jwt-token-can-t-be-verified into dev

Summary of Changes

Updates the _verify_token to 1. show better error messages, and 2. fix an issue where iat verification would fail due to the issue time being in the future compared to the pulsar clock.

Checklist

  • The MR has a clear and concise title
  • Code is self-documented and follows style guidelines.
  • Automated tests are written and pass successfully.
  • Regression tests (e.g. manually triggered system tests, manual GUI/tool tests, ...) are performed to make sure the MR does not break anything (when applicable)
  • Readme file is present and up-to-date.

Documentation Updates

Additional Notes

Closes #58 (closed)

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