register built-in filter by default

Author: zhiyuanliang-ms

src/Microsoft.FeatureManagement/ServiceCollectionExtensions.cs

@@ -58,6 +58,12 @@ public static IFeatureManagementBuilder AddFeatureManagement(this IServiceCollec
 
             services.TryAddScoped<IVariantFeatureManagerSnapshot>(sp => sp.GetRequiredService<FeatureManagerSnapshot>());
 
+            services.AddSingleton<PercentageFilter>();
+
+            services.AddSingleton<TimeWindowFilter>();
+
+            services.AddSingleton<TargetingFilter>();
+
             return new FeatureManagementBuilder(services);
         }