Add command to coder ping a workspace #749
Description
coder ping is useful to diagnose connection problems to workspaces. We should add support to the plugin to invoke it on a workspace. If we have trouble connecting to a workspace, it would be nice to prompt the user to run this command.
ping output is lightly formatted text. For a first iteration we could just display the output verbatim, but we could also consider an enhanced version that gets structured JSON from the CLI and nicely formats the results.