GoogleOAuth2AuthenticationHandler - Allow specific URI parameters

[adamking-grg]

I'd like to specify the approval_prompt option on Googles OAuth2 implementation, as per https://developers.google.com/identity/protocols/OpenIDConnect#authenticationuriparameters I need to add some uri parameters to the built in call made by the library.

Would it be possible for the GoogleOAuth2AuthenticationHandler to have it's options extended to support the range of parameters available in Googles implementation?

[adamking-grg]

I think I've been an idiot and been looking the wrong place. I can see these getting added in the ApplyResponseChallengeASync.