Add writeback to pg_stat_io

28e626bde00 added the concept of IOOps but neglected to include writeback
operations. ac8d53dae5 added time spent doing these I/O operations. Without
counting writeback, checkpointer write time in the log often differed
substantially from that in pg_stat_io. To fix this, add IOOp IOOP_WRITEBACK
and track writeback in pg_stat_io.

Bumps catversion.

Author: Melanie Plageman <[email protected]>
Reviewed-by: Kyotaro Horiguchi <[email protected]>
Reported-by: Andres Freund <[email protected]>
Discussion: https://postgr.es/m/20230419172326.dhgyo4wrrhulovt6%40awork3.anarazel.de

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