feat: add JdbcUserRepository (WIP)

...ava/ch/unige/solidify/auth/controller/UserController.java

...main/java/ch/unige/solidify/auth/model/LoginInfoData.java

src/main/java/ch/unige/solidify/auth/model/User.java

...ch/unige/solidify/auth/repository/JdbcUserRepository.java

...main/java/ch/unige/solidify/auth/service/UserService.java

src/main/resources/sql/user-schema.sql