feature: Add Zitadel as user authentication source

[bryan-robitaille]

Summary | Résumé

Adds Zitadel as a authentication source.

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Unresolved questions / Out of scope | Questions non résolues ou hors sujet

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Pull Request Checklist

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• Have you completely tested the functionality of change introduced in this PR? Is the PR solving the problem it's meant to solve within the scope of the related issue?
• The PR does not introduce any new issues such as failed tests, console warnings or new bugs.
• If this PR adds a package have you ensured its licensed correctly and does not add additional security issues?
• Is the code clean, readable and maintainable? Is it easy to understand and comprehend.
• Does your code have adequate comprehensible comments? Do new functions have docstrings?
• Have you modified the change log and updated any relevant documentation?
• Is there adequate test coverage? Both unit tests and end-to-end tests where applicable?
• If your PR is touching any UI is it accessible? Have you tested it with a screen reader? Have you tested it with automated testing tools such as axe?

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