Remove io prefix from pg_stat_io columns

Michael Paquier <michael@paquier.xyz>

Commit: 0ecb87e1fa07a733494e35636e55807b0f3fc1ed
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-04-20T22:21:50Z
Releases: 16.0
Remove io prefix from pg_stat_io columns

a9c70b46 added the statistics view pg_stat_io which contained columns
"io_context" and "io_object".  Given that the columns are in the
pg_stat_io view, the "io" prefix is somewhat redundant, so remove it.

The code variables referring to these fields are kept unchanged so as
they can keep their context about I/O.

Bump catalog version.

Author: Melanie Plageman
Reviewed-by: Kyotaro Horiguchi, Fabrízio de Royes Mello
Discussion: https://postgr.es/m/CAAKRu_aAQoJWrvT2BYYQvJChFKra_O-5ra3jhzKJZqWsTR1CPQ@mail.gmail.com

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