Feature: Example User management service with validations and meaningful error responses

[ArielMAJ]

Type of feature

🍕 Feature

Current behavior

User model/repository is directly called and returned on entrypoints. If user is not found or there is some other kind of error (e.g. user_id doesn't exist when getting/updating/deleting) we get a 500 status code.

Suggested solution

Implement a UserService and also add pydantic fields, in which it will correctly run validations on entrypoint requests before returning and raise meaning HTTPError responses in case of not found IDs, etc.

Additional context

No response

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