Add OnQueryLink handler for message extensions

Introduced a new `OnQueryLink` method to handle the `OnQueryLink` event for message extensions. This method returns a `MessagingExtensionResult` with a simple text response. Updated the `RegisterExtension` method to include the new `OnQueryLink` handler.

Author: rido-min

src/samples/Teams/TeamsAgent/TeamsAgent.cs

@@ -25,6 +25,7 @@ public TeamsAgent(AgentApplicationOptions options, IHttpClientFactory httpClient
                 tae.OnMessageEdit(MessageEdited);
                 tae.MessageExtensions.OnQuery("findNuGetPackage", OnQuery);
                 tae.MessageExtensions.OnSelectItem(OnSelectItem);
+                tae.MessageExtensions.OnQueryLink(OnQueryLink);
             });
             AdaptiveCards.OnSearch("dataset", OnSearchDS);
             OnMessage("/help", (t, _, ct) => t.SendActivityAsync("TeamsAgent demo", cancellationToken: ct));
@@ -33,6 +34,11 @@ public TeamsAgent(AgentApplicationOptions options, IHttpClientFactory httpClient
             OnActivity(ActivityTypes.Message, OnMessageAsync);
         }
 
+        private Task<MessagingExtensionResult> OnQueryLink(ITurnContext turnContext, ITurnState turnState, string url, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new MessagingExtensionResult() { Text = "On Query Link" });
+        }
+
         private Task<IList<AdaptiveCardsSearchResult>> OnSearchDS(ITurnContext turnContext, ITurnState turnState, Query<AdaptiveCardsSearchParams> query, CancellationToken cancellationToken)
         {
             var qt = query.Parameters.QueryText;