workspaces foreach suggestions

[MarcCelani-at]

I was playing around with yarn.build and there are some elements of the user experience I really love as compared to workspaces foreach.

• Shows progress of parallel jobs similar to yarn install steps
• Summarizes success/failures of each sub-command at the end

I don't want to use the plugin because it is fairly large and I don't have time to read through all the code, and it's not an officially supported yarn plugin, but wanted to share that it's really great and I wish those features were offered in workspaces foreach.