Support PDO PostgreSQL

Summary:
Allow to query PostgreSQL databases through PDO.

Support has been added for both PHP 8.4+ Pdo\Pgsql
and previous versions PDO class.

Use case: Orbeon Forms store data in a PostgreSQL database,
an application for Obsidian Workspaces is planned to read forms
and annotate them into an Obsidian collection.

Test Plan: Unit tests provided for both PDO PostgreSQL engines

Differential Revision: https://devcentral.nasqueron.org/D3804