HF RL Explorer

Add network wait time metric to long request logs and per-table stat command

Add network wait time metric to long request logs and per-table stat command: a task in LegoFlow-SWE (Harbor dataset). Example log output: LONG REQUEST 9562 msec … sql=select from jobs, ncols=10 netwaitms=9148, rowcount=48445, cost=48454.000000

The task

Example log output: ``` LONG REQUEST 9562 msec … sql=select * from jobs, ncols=10 netwaitms=9148, rowcount=48445, cost=48454.000000 ```

Part of Lego-X/LegoFlow-SWE.