fix: implement configuration method

Author: metacosm

sample-operators/mysql-schema/src/main/java/io/javaoperatorsdk/operator/sample/dependent/SchemaDependentResource.java

@@ -39,6 +39,11 @@ public SchemaDependentResource() {
     super(Schema.class);
   }
 
+  @Override
+  public Optional<ResourcePollerConfig> configuration() {
+    return Optional.of(new ResourcePollerConfig((int) getPollingPeriod(), dbConfig));
+  }
+  
   @Override
   public void configureWith(ResourcePollerConfig config) {
     this.dbConfig = config.getMySQLDbConfig();