docs: public DBEngineVersion withSupportedCharacterSets(CharacterSet... supportedCharacterSets) {
          if (this.supportedCharacterSets == null) {
              setSupportedCharacterSets(new java.util.ArrayList<CharacterSet>(supportedCharacterSets.length));
          }
          for (CharacterSet ele : supportedCharacterSets) {
              this.supportedCharacterSets.add(ele);
          }
          return this;
      }