[TASK]Implement Spring Security UserDetails & UserDetailsService interfaces to handle user details and authentication

[ulrich-jato]

User Story:

Description

• The UserDetails interface is a core part of Spring Security. It represents essential user information, such as a user's username, password, and their granted authorities (roles). When implementing this interface, we create a class that holds these user details. This class will include fields like username, password, and a collection of authorities.
• The UserDetailsService interface also a core component of Spring Security. It is used to load user details during the authentication process. Implementing this interface requires defining a method called loadUserByUsername(String username). This method retrieves user details based on a given username.