Implement Follower Service, OAuth2 Enhancements, and Localization Support

[aalamu]

Description:

This pull request addresses the following key features and improvements based on JIRA Ticket FLEENFEEN-10:

1. Follower Service Implementation:

   • Added FollowerService to handle user following functionalities:
     • Retrieve the list of users that a given user is following.
     • Retrieve the list of followers for a user.
     • Follow and unfollow users.
   • Created response classes to encapsulate data related to followers and following actions.
   • Integrated these functionalities into the existing user management system.

2. OAuth2 Enhancements:

   • Removed unused Oauth2AuthorizationRepository.findByMember(Member) method.
   • Refactored repository calls in GoogleOauth2Service and LiveBroadcastServiceImpl to use findByMemberAndServiceType(Member, Oauth2ServiceType).
   • Added methods for handling OAuth2 token refresh and checking token expiry.
   • Updated Oauth2AuthenticationRequest to include refreshToken and Oauth2Authorization.
   • Renamed googleOauthAuthorizationId to oauth2AuthorizationId in the Oauth2Authorization entity for consistency.

3. Localization Support:

   • Introduced ApiResponse and LocalizedResponse classes to enable localized messaging in response classes.
   • Created message source files for error, response, and default messages.
   • Configured MessageSource to manage different message sources in MessageSourceConfiguration.
   • Updated services, including AuthenticationServiceImpl and MfaServiceImpl, to return localized responses based on the user's locale.
   • Added message keys to response classes extending ApiResponse for localization.

4. General Refactoring and Bug Fixes:

   • Conducted general refactoring across various classes and methods to improve code quality and maintainability.
   • Added of(String) method to all enums for easier creation of enum instances from strings.
   • Removed redundant methods like parseEnumOrNull and used the newly added of(String) method.
   • Refactored MfaService and AuthenticationService for enhanced security and functionality.
   • Fixed bugs related to MFA code verification and message publishing in ProfileRequestPublisher.
   • Enabled JPA Auditing and added EntityListener to FleenFeenEntity for automatic management of timestamps.
   • Updated Liquibase migration scripts to reflect changes in the Oauth2Authorization entity and reordered SQL insert statements.

5. Additional Implementations:

   • Implemented UserDetailsServiceImpl for managing user details.
   • Added and updated various controllers such as AuthenticationController, MfaController, VerificationController, and Oauth2Controller.
   • Created new methods for handling user sign-up and location details.
   • Implemented MaskedEmailAddress and MaskedPhoneNumber classes to mask sensitive data.

Testing:

• Additional testing is required on the localization feature across different locales to ensure proper message retrieval and display.

Notes:

• Consider extending OAuth2 functionality to cover additional service types in future iterations.
• This PR includes significant refactoring; please review carefully to ensure no regressions are introduced.