Request: Support OAuth 2.0 Authorization Code Flow with Refresh Tokens

[franz-josef-kaiser]

The fact stated in for e.g. #304 didn't state the test of time: Having refresh tokens that are used to exchange short lived access tokens (gladly) is much more common and secure to date.

Is there a possibility to get this feature into the plugin? Currently we are resorting back to Insomnia, Hoppscotch, Postman and the likes to have the ability to perform one request to fetch an access token before the actual request. It would be great if this would be available in the plugin as well.

Thanks a ton for your work anyway!