Add ConfigurationType Types to generated OpenAPI

This allows clients to see and work with the associated types for each NamedConfiguration key, even if the UpdateNamedConfiguration endpoint doesn't properly advertise its types.

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -398,6 +398,12 @@ namespace Emby.Server.Implementations.AppBase
             });
         }
 
+        /// <inheritdoc />
+        public ConfigurationStore[] GetConfigurationStores()
+        {
+            return _configurationStores;
+        }
+
         /// <inheritdoc />
         public Type GetConfigurationType(string key)
         {