string prefixes and base64 encoder

[joocer]

Thank you for opening a Pull Request!

We appreciate your contribution to Opteryx. Your time and effort make a difference, and we’re excited to review your changes. To help ensure a smooth review process, please check the following:

Checklist for a Successful PR

• Start the conversation: If you haven’t already, raise a bug/feature request or start a discussion. This ensures alignment on the change and approach.
• Run the tests: Confirm that all tests pass without errors.
• Maintain code coverage: If you’ve added or modified source code ensure new tests are added to the test suite.
• Update documentation and tests (if applicable): If your changes impact functionality, make sure the relevant docs and test cases are updated.

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Fixes: #2947

Please replace <issue_number_goes_here> with the corresponding issue number.

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Thank you for contributing to Opteryx! 🎉

[github-actions]

📦 Opteryx build version: 0.26.2-beta.1904

[github-actions]

📦 Opteryx build version: 0.26.2-beta.1905

[github-actions]

📦 Opteryx build version: 0.26.2-beta.1906

[github-actions]

📦 Opteryx build version: 0.26.2-beta.1907