Add support for positional parameters in builtin shell

[hrougier]

Workspaces are one of the most popular feature of yarn.
With the builtin shell, it is now very simple to write scripts which will run regardless of the platform.
However, working with the CLI can be overwhelming in development due to the verbosity of the commands, for example

yarn workspace @myscope/myworskpace run lint
yarn workspace @myscope/myworskpace run build --some option
yarn workspace @myscope/myworskpace run start --some option --other option

Having a lot of workspaces in a monorepo with a similar set of scripts, one can make shortcuts in the root package.json using bash positional parameters:

{
  "name": "mymonorepo",
  "private": true,
  "workspaces": {
    "packages": [
      "packages/**"
    ]
  },
  "scripts": {
    "run:workspace": "bash -c 'yarn workspace @myscope/$1 run $0 ${@:2}'",
    "build": "yarn run:workspace build",
    "lint": "yarn run:workspace lint",
    "start": "yarn run:workspace start"
  }
}

So it becomes super easy to run a script on any workspace:

yarn lint myworskpace
yarn build myworskpace --some option
yarn start myworskpace --some option --other option

And it still has the benefits of providing you the list of workspaces in case you mistype something ❤️

yarn start wrongworkspace
Usage Error: Workspace '@myscope/wrongworkspace' not found. Did you mean any of the following:
  - @myscope/myworskpace

What about supporting positional parameters (the ${@:2} part which means "all arguments starting from the second one") in the builtin shell so this becomes possible without the use of bash -c?

Regards