Demo: add log of user data and public API route.

[WilmsJochen]

💡 PR Summary generated by FirstMate

New API Route and Logging Enhancements

Changes:
New API Route:

• Added /user-data/:id endpoint in exampleRouter.js to fetch user data.

Logging Implementation:

• Integrated logging in ExampleService to log user data retrieval.
• Created NewService class with logging for data fetching by ID.

CI Workflow Update:

• Modified .github/workflows/firstmate.yaml to run tests after package installation.

TLDR: Introduced a new user data API route, added logging for data retrieval, and updated CI workflow to include tests. Focus on exampleRouter.js and exampleService.js for the main functionality changes.

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