Allow to interact with a MySQL database

Summary:
This library provides a simple database abstraction layer
allowing to directly use SQL queries.

Inspired of the phpBB 2 sql_db class, it has evolved
to support MySQLi and PDO drivers.

Can be used as drop-in replacement, with legacy migration paths
for applications like Nasqueron Tools, Zed, Obsidian Workspaces.

Test Plan: Tested on Zed

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D2498