Add a global prompt setting to the Google web provider

Author: StellaAlexis

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs

@@ -1924,6 +1924,7 @@ public ValueTask HandleAsync(ProcessChallengeContext context)
                 var settings = context.Registration.GetGoogleSettings();
 
                 context.Request["access_type"] = settings.AccessType;
+                context.Request.Prompt = settings.Prompt;
             }
 
             // By default, Huawei doesn't return a refresh token but allows sending an "access_type"

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml

@@ -1129,6 +1129,9 @@
 
     <Setting PropertyName="AccessType" ParameterName="type" Type="String" Required="false"
              Description="The value used as the 'access_type' parameter (can be set to 'offline' to retrieve a refresh token)" />
+
+    <Setting PropertyName="Prompt" ParameterName="prompt" Type="String" Required="false"
+             Description="The value used as the 'prompt' parameter: can be set to none, consent (triggers a consent prompt on every session) or select_account (allows the user to select which account to use on each session)" />
   </Provider>
 
   <!--