Replaces __dirname concatentation in pg test scripts so that editors like
VS Code can automatically generate typings and support code navigation (F12).
This switches the internals to use faster protocol parsing & serializing. This results in a significant (30% - 50%) speed up in some common query patterns. There is quite a bit more performance work I need to do, but this takes care of some initial stuff & removes a big fork in the code.
The `readyState` of a newly-created `net.Socket` changed from `'closed'` to `'open'` in Node 14.0.0, so this makes the JS driver work on Node 14.
`Connection` now always calls `connect` on its `stream` when `connect` is called on it.
