Locate VS Code CLI dynamically

[philipnickel]

CODE_CLI is hardcoded to /Applications/Visual Studio Code.app/Contents/Resources/app/bin/code. If VS Code is installed in ~/Applications, under a different name, or managed by Homebrew cask, this breaks. Try command -v code first and fall back to the hardcoded path, with a clear error if neither exists.

[zerothi]

I recall on mac that one have to execute a command in vscode to expose the code command, what if the user didn't do that? Should we guess on a couple of places where we might expect VS Code to exist? We don't even know if they've downloaded it multiple times.
Although this shouldn't be a problem, since the configurations are global.