refactor(ClientOptions): add AfterHttpInit-property and bind to dependency injection

src/Leanetec.EConnect.Infrastructure/ClientOptions.cs

@@ -9,4 +9,6 @@ public class ClientOptions
     public TimeSpan? Timeout { get; set; }
 
     public Dictionary<string, string?>? QueryStrings { get; set; }
+
+    public Action<HttpClient>? AfterHttpInit { get; set; }
 }