Allow for filtering of document type allowed children and allowed at root when creating new content. (#18029)

* Creates IContentTypeFilterService with a "no-op" implementation for filtering the content types available for selection at root and as children.

* Rework to collection so packages and implementors can stack filters if they need to.

src/Umbraco.Core/DependencyInjection/UmbracoBuilder.cs

@@ -46,6 +46,7 @@ using Umbraco.Cms.Core.Telemetry;
 using Umbraco.Cms.Core.Templates;
 using Umbraco.Cms.Core.Web;
 using Umbraco.Extensions;
+using Umbraco.Cms.Core.Services.Filters;
 
 namespace Umbraco.Cms.Core.DependencyInjection
 {
@@ -444,7 +445,6 @@ namespace Umbraco.Cms.Core.DependencyInjection
             // Routing
             Services.AddUnique<IDocumentUrlService, DocumentUrlService>();
             Services.AddNotificationAsyncHandler<UmbracoApplicationStartingNotification, DocumentUrlServiceInitializerNotificationHandler>();
-
         }
     }
 }