Add support for connecting to redis and postgres via unix sockets

[RaghavSood]

Both redis and postgres support connections over unix sockets, which can be helpful when all services are running on the same machine outside of docker.

The way the DSNs are presently constructed makes this impossible

It would be nice to have a way to connect via sockets

[oneEyedSunday]

Hello @RaghavSood can you provide a sample url and error dump for when you attempt to connect with a unix socket? Thanks.