Add new pg_walsummary tool.

Robert Haas <rhaas@postgresql.org>

Commit: ee1bfd168390bc843c6704d16e909692c0a79f27
Author: Robert Haas <rhaas@postgresql.org>
Date: 2024-01-11T17:48:27Z
Releases: 17.0
Add new pg_walsummary tool.

This can dump the contents of the WAL summary files found in
pg_wal/summaries. Normally, this shouldn't really be something anyone
needs to do, but it may be needed for debugging problems with
incremental backup, or could possibly be useful to external tools.

Discussion: http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzJnXSE-kRGw@mail.gmail.com

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