[Auth] Implement Authentication Guard to check if the user is logged in or not.

[ahmedeid6842]

Done:

• Inherit CanActivate interface and implement canActivate method.
• check if there is userId assigned to user session or not, which is a check for user authentication.

  Note: By default by using CanActivate interface, it'll handle the return of NotAuthenticated 401 status in case you return falsy.