While reviewing #352966 I noticed that the pg_anonymizer test fails for
postgresql 17. The reason for that is that `pkgs.postgresql` is v16 and
using its psql to connect against a v17 database doesn't work.
I decided that we'll just use the latest available package in here. I
don't want to introduce another attribute (`postgresql_latest`), if
there are too many instances of that we're blocked on adding new
postgresql majors directly to master again which is the current status
quo. With the test rework in #352966 it's also way easier to catch this.
This is a Go program inside the sources of `postgresql_anonymizer` that
allows to perform database dumps, but with anonymized data. I figured
that it's a little awkward to have a client program to be part of the
extension package.
So I decided to create a second package called `pg-dump-anon`. Since
it's one repository, both share `version` & `src`.
Also extended the VM test to make sure we're getting properly anonymized
data when dumping with `pg_dump_anon`.
