Public schema table embedding (#803)

* Alter fixture to test objects in public schema

Properly erase and restore the public schema -- requires permissions to install pgcrypto each time.

* Test for fks through public schema tables

* Thanks @fab1an

test/fixtures/database.sql

@@ -1,3 +1,3 @@
 set client_min_messages to warning;
-DROP SCHEMA IF EXISTS test, private, postgrest, jwt, تست CASCADE;
-DROP TYPE IF EXISTS jwt_token CASCADE;
+DROP SCHEMA IF EXISTS test, private, postgrest, jwt, public, تست CASCADE;
+DROP TYPE IF EXISTS jwt_token CASCADE;