`no-extraneous-dependencies` requeres restarting eslint server in vscode when adding new dependencies

[DetachHead]

to reproduce:

1. install the eslint vscode extension
2. add an import for a dependency that's not in your package.json
3. once the no-extraneous-dependencies error appears, add the dependency to your package.json

the error will stay there until you press F1 and run the ESLint: Restart ESLint Server task

[Jordan Harband]

You have to restart the eslint server (or all of vscode) whenever any dependencies change, this isn't unique to this plugin.

It's an inherent issue with the eslint vscode extension, because eslint rules aren't designed to be long-running.