Remove Authentication Controllers and security validators

[felipebonezi]

Is your feature request related to a problem? Please describe.
Authentication controllers and validators will be useless because we'll integrate with Keycloak OAuth Server.

Describe the solution you'd like
Remove all auth controllers and validators.

Describe alternatives you've considered
N/A

Additional context
You don't need to remove any class that identifies user session because we can still use it when we integrate with Keycloak (or other OAuth/OIDC Service).