Update Visual Studio Code extension to support code formatting

[yorickpeterse]

Description

https://github.com/inko-lang/vscode provides a simple Visual Studio Code extension that adds syntax support for Inko. I'd like to extend this extension as to support code formatting using inko fmt, as introduced in #692. I took a brief look myself, but couldn't quite figure out how to make this work. Most notably, it seems most existing formatting extensions are horribly complicated or use a language server. As such, it would be greatly appreciated if somebody could take a look at this 😃

Related work

No response