Feat/update google client settings

[StellaAlexis]

Small PR to add the prompt value to the Google Web Integration configuration. Docs of the parameter can be found here
https://developers.google.com/identity/openid-connect/openid-connect#authenticationuriparameters

[kevinchalet]

Thanks for your PR!

FYI, adding the setting the .xml isn't enough (it won't do anything, basically). You also need to attach the prompt value to the request. See how it's done for the other providers:

openiddict-core/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs

Lines 2030 to 2038 in 7b9fd76

	// By default, Zoho doesn't return a refresh token but
	// allows sending an "access_type" parameter to retrieve one.
	else if (context.Registration.ProviderType is ProviderTypes.Zoho)
	{
	var settings = context.Registration.GetZohoSettings();
	context.Request["access_type"] = settings.AccessType;
	context.Request.Prompt = settings.Prompt;
	}

[StellaAlexis]

Ah thanks for pointing that out! I think I added the required extra change now. Also checked if there was anything else that needed updating or any tests around this part but I couldn't find any.

[kevinchalet]

Thanks! ❤️

[kevinchalet]

Merged. Congrats for your first contribution to OpenIddict! 🎉