Add expiry date and session token to Auth token Model

[SebaMutuku]

Most identity and access management (IAM) solutions like keycloak provide several extra details when authentication a user and generating token.
These include token expiry date and session token. I think it would be better enhancing the current Token model to include these two and enhancing the current logics of saving and retrieving data from the model. For now, we are forced to use 3rd party libraries to support this.