Add support for Yugabyte node-postgres fork

[oskardudycz]

Yugabyte has an extended version of node-postgres, adding capabilities like load-balancing. This could be a good proof of concept of supporting other PostgreSQL drivers, as it's mostly the same as node-postgres.

See:

• https://docs.yugabyte.com/preview/drivers-orms/smart-drivers
• https://github.com/yugabyte/node-postgres