Install extension to restart TS server

[Tobbe]

VS code seems to not pick up on some imports, like for src/utils/cn when adding new components.
Restarting the TS server seems to help.
It'd be cool if we could do that automatically after running the rw-shad script.

Plan for this right now:

1. Write a VSCode extension that triggers await vscode.commands.executeCommand("typescript.restartTsServer");
2. Install the extension by running something like code --install-extension my-extension.name

(This issue was copied from redwoodjs/setup-rw-shad#1)