Backend - Add/Delete Mentors-Admin-App - Self-Sprint-3

[askinss]

Add the API endpoints but verify if it is nothing existing already.
Add Mentors Admin
Delete Mentor Admin

check corresponding Frontend
https://github.com/orgs/ALCOpenSource/projects/16/views/1?pane=issue&itemId=24567008

[Albert-Byrone]

@askinss What do you think about this

class User(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key=True)
    name = Column(String)
    email = Column(String, unique=True)
    password = Column(String)
    role_id = Column(Integer, ForeignKey("roles.id"))
    role = relationship("Role", back_populates="users")

class Role(Base):
    __tablename__ = "roles"
    id = Column(Integer, primary_key=True)
    name = Column(Enum("user", "mentor", "mentor_manager", name="role_types"))
    users = relationship("User", back_populates="role")

    def __repr__(self):
        return f"<Role(name={self.name})>"