public Configuration toConfiguration() {
      HashMap<String, String> config = new HashMap<>();
      config.putAll(flinkConf);
      config.putAll(flinkOptions);
      return Configuration.fromMap(config);
    }
The properties with prefix "flink-conf." will be merged with the following priority and
transformed into Flink options. 1. optimizing-group properties 2. optimizing-container
properties

@return flink options, format is `-Dkey1="value1" -Dkey2="value2"`
amoro-ams/src/main/java/org/apache/amoro/server/manager/FlinkOptimizerContainer.java