V14/feature/all segment endpoint (#16054)

* Added All Segments service with backing noopService

* Add openapi spec

* Apply suggestions from code review

Co-authored-by: Nikolaj Geisle <70372949+Zeegaan@users.noreply.github.com>

* Fix ctor

---------

Co-authored-by: Sven Geusens <sge@umbraco.dk>
Co-authored-by: Nikolaj Geisle <70372949+Zeegaan@users.noreply.github.com>

src/Umbraco.Core/DependencyInjection/UmbracoBuilder.cs

@@ -390,6 +390,9 @@ namespace Umbraco.Cms.Core.DependencyInjection
             Services.AddSingleton<IMediaPermissionAuthorizer, MediaPermissionAuthorizer>();
             Services.AddSingleton<IUserGroupPermissionAuthorizer, UserGroupPermissionAuthorizer>();
             Services.AddSingleton<IUserPermissionAuthorizer, UserPermissionAuthorizer>();
+
+            // Segments
+            Services.AddUnique<ISegmentService, NoopSegmentService>();
         }
     }
 }