Run additional script during uninstall for VSCode to remove LS and files completely

[thadguidry]

Installation of elmtooling.elm-ls-vscode-xxx on VSCode puts most of it's files under a path of
<vscode>/data/extensions/.elmtooling.elm-ls-vscode-xxxx
and where after uninstalling the extension from VSCode that path and all files within is left untouched and should be removed completely.

Expected Behavior

In VSCode, clicking uninstall of the plugin(s) should completely remove files for language server (LS)

Current Behavior

After clicking uninstall, additional cleanup is not done to completely remove node remnants and files/dependencies under <vscode>/data/extensions/.elmtooling.elm-ls-vscode-xxxx

Possible Solution

It should be fairly trivial to run a node script and add this additional script to package.json manifest as documented by MS VSCode's Extension uninstall hook

{
  "scripts": {
    "vscode:uninstall": "npm run uninstall-cleanup"
  }
}

Steps to Reproduce (for bugs)

Context

Your Environment

• Version used: .elmtooling.elm-ls-vscode-2.1.0
• Editor used: VSCode Insiders latest
• Environment name and version (e.g. node.js 5.4):
• Operating System and version: Windows 10 Pro 10.0.19043