feat: add time to show processlist for the session elapsed how many seconds

[BohuTANG]

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Summary

Summary about this PR:
Add new column time to show how many seconds of the session elapsed

mysql> show processlist\G;
*************************** 1. row ***************************
                      id: c1152483-de11-4375-bfe3-a35ad2ae9311
                    type: MySQL
                    host: 127.0.0.1:57636
                    user: root
                   state: Query
                database: default
              extra_info: select sum(number) from numbers(10000000000000)
            memory_usage: 0
  dal_metrics_read_bytes: 0
 dal_metrics_write_bytes: 0
 scan_progress_read_rows: 9663540000
scan_progress_read_bytes: 77308320000
     mysql_connection_id: 9
                    time: 42

Fixes #7664

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Name	Status	Preview	Updated
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