#453 Added PostgreSQL initial db scripts (User) (#556)

* PostgreSQL initial commit of translation from SQL Server to PostgreSQL

* snake_case added.
set search path for schema.  schema qualified name no longer needed for creation and access of functions.

* Table DDL for PostgreSQL

src/Sql/PostgreSQL/Schema/bitwarden.sql

@@ -0,0 +1,5 @@
+DROP SCHEMA bitwarden cascade;
+
+CREATE SCHEMA bitwarden AUTHORIZATION bitwarden;
+
+ALTER ROLE bitwarden SET search_path TO bitwarden;