* Remove assert from globals
* Remove Client from globals
* Remove global test function
* Remove MemoryStream from globals
* Require assert in SASL integration tests
* Attempt to use a postgres with ssl?
* Use latest image
* Remove connection tests - they test internals that are better covered by testint the client
I didn't do much to "modernize" the pg-native codebase other than running it through the standard eslint --fix that is applied to the rest of the code. There's some easy opportunities there to update it to es6 and so on...it still uses some pretty antiquated coding styles in places. This PR re-introduces the native tests on node v20, and updates test matrix to drop unsupported versions of node & add in node v22.
Replaces __dirname concatentation in pg test scripts so that editors like
VS Code can automatically generate typings and support code navigation (F12).
