IPM (ZPM) extension for VS Code

Create a VS Code extension that provides an alternative to the CLI user interface with the InterSystems Package Manager (aka IPM / ZPM). When working in VS Code a developer sometimes wants to install additional packages onto their IRIS server. Or perhaps they are coding a new package (or improving an existing one), so want to run packaging commands. Doing these tasks, and other IPM ones, without resorting to a command shell on the server will be a UX improvement.