Move some functions from postmaster.c to a new source file

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: f1baed18bc3db50c72bfb00b6247b47689158445
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-03-18T09:35:05Z
Releases: 17.0
Move some functions from postmaster.c to a new source file

This just moves the functions, with no other changes, to make the next
commits smaller and easier to review. The moved functions are related
to launching postmaster child processes in EXEC_BACKEND mode.

Reviewed-by: Tristan Partin, Andres Freund
Discussion: https://www.postgresql.org/message-id/7a59b073-5b5b-151e-7ed3-8b01ff7ce9ef@iki.fi

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