AccessExclusiveLock new relations just after assigning the OID.

This has no user-visible, important consequences, since other sessions'
catalog scans can't find the relation until we commit.  However, this
unblocks introducing a rule about locks required to heap_update() a
pg_class row.  CREATE TABLE has been acquiring this lock eventually, but
it can heap_update() pg_class.relchecks earlier.  create_toast_table()
has been acquiring only ShareLock.  Back-patch to v12 (all supported
versions), the plan for the commit relying on the new rule.

Reviewed (in an earlier version) by Robert Haas.

Discussion: https://postgr.es/m/20240611024525.9f.nmisch@google.com

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