Refresh Token does not expires.

### Required Terms

- [X] I agree to follow this project's [Code of Conduct](https://github.com/heroku/roadmap/blob/main/CODE_OF_CONDUCT.md)
- [X] I have read and accept the [Salesforce Program Agreement](https://www.salesforce.com/company/program-agreement/)

### What service(s) is this request for?

All services using Oauth

### Tell us about what you're trying to solve. What challenges are you facing?

For Add-on to communicate its clients they need an Oauth token which expires in 8 hrs. In order to renew the token a refresher token is required to be submitted to get the oauth token. This refresher token never expires. Both the tokens should have a expiry in order to improve the security posture of this Oauth based authorization.