Move pg_multixact SLRU page format definitions to a separate header

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: bb3b1c4f64620ca05d86a20a26c8fa4ca1cf7b78
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2025-12-09T11:45:01Z
Move pg_multixact SLRU page format definitions to a separate header

This makes them accessible from pg_upgrade, needed by the next commit.
I'm doing this mechanical move as a separate commit to make the next
commit's changes to these definitions more obvious.

Author: Maxim Orlov <orlovmg@gmail.com>
Discussion: https://www.postgresql.org/message-id/CACG%3DezbZo_3_fnx%3DS5BfepwRftzrpJ%2B7WET4EkTU6wnjDTsnjg@mail.gmail.com

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