Add New API Call for User Profile

[lorriborri]

Situation

Currently, our application lacks an endpoint to retrieve user profile information (username, email, Role). Users need a way to access their profile details through a dedicated API call.

Wanted

We need a new API endpoint
e.g. api/user/profile that allows authenticated users to retrieve their profile information.

The endpoint should:

• Be accessible via a GET request.
• Return user profile details such as username, email and role.

Solution

The new Endpoint should be in a dedicated domain for the webui
(maybe move the getAssignedProjectDataList in this domain as well - the usecase must be moved anyway)

• add GET request to openapi.yaml
• create new UseCase
• create new REST controller
• create new Service