[dinky-admin] Add support for exporting Prometheus monitoring data #4478
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添加一个/metric/prometheus接口,用于导出flink任务的监控数据给prometheus
1、 /metric/prometheus 导出全部的监控数据
2、/metric/prometheus/STATUS 导出任务状态数据
3、/metric/prometheus/JOBMANAGER 导出jobmanager的监控数据
4、/metric/prometheus/TASKMANAGER 导出taskmanager的监控数据
5、/metric/prometheus/VERTICES 导出vertices的监控数据