improve: add InformerEventSourceConfiguration withNamespaces overloaded version

Signed-off-by: Attila Mészáros <a_meszaros@apple.com>

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/informer/InformerEventSourceConfiguration.java

@@ -194,6 +194,11 @@ public Builder<R> withNamespaces(Set<String> namespaces) {
       return this;
     }
 
+    public Builder<R> withNamespaces(String... namespaces) {
+      config.withNamespaces(Set.of(namespaces));
+      return this;
+    }
+
     public Builder<R> withNamespacesInheritedFromController() {
       withNamespaces(SAME_AS_CONTROLLER_NAMESPACES_SET);
       return this;