adding status for COPY progress report

Hi,
Please see attached for enhancement to COPY command progress.

The added status column would allow users to get the status of the most
recent COPY command.

Below is sample output.

Thanks

yugabyte=# SELECT relid::regclass, command, status,
yugabyte-# type, bytes_processed, bytes_total,
yugabyte-# tuples_processed, tuples_excluded FROM
pg_stat_progress_copy;
relid | command | status | type | bytes_processed | bytes_total
| tuples_processed | tuples_excluded
----------+-----------+--------+------+-----------------+-------------+------------------+-----------------
copy_tab | COPY FROM | PASS | FILE | 152 | 152
| 12 | 0
(1 row)