Upgrade to JSqlParser 5.0

See https://github.com/JSQLParser/JSqlParser/releases/tag/jsqlparser-4.7 and more importantly https://jsqlparser.github.io/JSqlParser/migration47.html and https://jsqlparser.github.io/JSqlParser/migration50.html.

The AST API changed a lot so it's going to require some work. Fortunately, we don't seem to have any external dependency reusing jsqlparser, so it will mostly be about rewriting our own code.