docs: public ListReusableDelegationSetsResult withDelegationSets(DelegationSet... delegationSets) {
          if (this.delegationSets == null) {
              setDelegationSets(new com.amazonaws.internal.SdkInternalList<DelegationSet>(delegationSets.length));
          }
          for (DelegationSet ele : delegationSets) {
              this.delegationSets.add(ele);
          }
          return this;
      }