Re: sorting function names in packages, you can have this today, simply access VS Code's Explorer panel and use the Outline section. It will allow you to sort by name, position, or type, and it is a true navigator.
I thought you were trying to make this a replacement for SQL Developer, which has a right-click Order members by for Package members. When you have a package with 100+ members in it, this is extremely useful, and a lot better than having to figure out how to use the Explorer panel, which seems to show only open editors and not the tree view.