Add a test module for Object Access hooks
This includes tests of both the newly added name type object access
hooks and the older Oid type hooks, and provides a useful example
of how to use the hooks.
Mark Dilger, based on some code from Joshua Brindle.
Discussion: https://postgr.es/m/
47F87A0E-C0E5-43A6-89F6-
D403F2B45175@enterprisedb.com