Friendlier exchangeCodeForSession() error messages for missing auth code / code verifier (gotrue-js)

[kasper9n]

Currently this is the error message you get from exchangeCodeForSession() when a user clicks a login link on a different device:

invalid request: both auth code and code verifier should be non-empty

It would be great if gotrue-js detected that this was missing beforehand, and then provided a nice error message like this:

Code verifier missing. Make sure to use the same device to complete the login!

https://github.com/supabase/gotrue-js/blob/2438c0c3c3ce952d85cac9c16095fef439a64174/src/GoTrueClient.ts#L495-L504