refactor: move constant to Controller interface to avoid extra import

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/Controller.java

@@ -10,6 +10,7 @@
 public @interface Controller {
 
   String NULL = "";
+  String WATCH_CURRENT_NAMESPACE = "JOSDK_WATCH_CURRENT";
 
   String name() default NULL;
 

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

@@ -1,11 +1,11 @@
 package io.javaoperatorsdk.operator.api.config;
 
 import io.fabric8.kubernetes.client.CustomResource;
+import io.javaoperatorsdk.operator.api.Controller;
 import java.util.Collections;
 import java.util.Set;
 
 public interface ControllerConfiguration<R extends CustomResource> {
-  String WATCH_CURRENT_NAMESPACE = "JOSDK_WATCH_CURRENT";
 
   String getName();
 
@@ -29,7 +29,7 @@ default boolean watchAllNamespaces() {
 
   default boolean watchCurrentNamespace() {
     final var namespaces = getNamespaces();
-    return namespaces.size() == 1 && namespaces.contains(WATCH_CURRENT_NAMESPACE);
+    return namespaces.size() == 1 && namespaces.contains(Controller.WATCH_CURRENT_NAMESPACE);
   }
 
   default RetryConfiguration getRetryConfiguration() {