643 issuance verification tests for w3c sd jwt

[philpotisk]

Description

Provide a clear and concise description of the changes made in this pull request.

Fixes #643

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist

• [ ] I have performed a self-review of my code
• [ ] If it is a core feature, I have added thorough tests
• [ ] Do we need to implement analytics?
• [ ] Will this be part of a product update? If yes, please write one phrase about this update.
• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules