pg_resetwal: Add --char-signedness option to change the default char signedness.

Masahiko Sawada <msawada@postgresql.org>

Commit: 30666d1857d7a785331f5805c20ec19430500466
Author: Masahiko Sawada <msawada@postgresql.org>
Date: 2025-02-21T18:14:36Z
Releases: 18.0
pg_resetwal: Add --char-signedness option to change the default char signedness.

With the newly added option --char-signedness, pg_resetwal updates the
default char signedness flag in the controlfile. This option is
primarily intended for an upcoming patch that pg_upgrade supports
preserving the default char signedness during upgrades, and is not
meant for manual operation.

Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/CB11ADBC-0C3F-4FE0-A678-666EE80CBB07%40amazon.com

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