Allow string and array notations for a route

This is required for Gateway metadata generation to work
There the provider routes need parameters to be able to load. And
loading the uri in the DI extension is not possible.

Author: MKodde

src/Metadata/MetadataConfiguration.php

@@ -20,15 +20,15 @@
 
 class MetadataConfiguration
 {
-    public string $entityIdRoute = '';
+    public string|array $entityIdRoute = '';
 
     public bool $isSp = false;
 
-    public string $assertionConsumerRoute = '';
+    public string|array $assertionConsumerRoute = '';
 
     public bool $isIdP = false;
 
-    public string $ssoRoute = '';
+    public string|array $ssoRoute = '';
 
     public ?string $spCertificate = null;