feat(core): "cwd" option for commands runner

[rarmatei]

Adds a cwd option to the @nrwl/workspace:run-commands builder:

"print-working-directory": {
          "builder": "@nrwl/workspace:run-commands",
          "options": {
            "commands": [
              {
                "command": "pwd"
              }
            ],
            "cwd": "apps/frontend/src"
          }
        }

(conceptually the same as the cwd option when creating a child process in Node)

[rarmatei]

@jaysoo - was there any reason we were not restricting additionalProperties before? Let me know if you can think of any issues with me adding this

[vsavkin]

I think we will want this to be true so we can in theory pass extra params and forward them to the underlying command. We don't do it now, but we should

[rarmatei]

I see - yes, I initially thought we can use the args option for that - but I can see how it's a different use-case..args is more powerful / allows interpolation throughout the command and needs to be set-up beforehand in workspace.json

while allowing extra options would be simpler if one would want to just forward them to the underlying command like you say e.g. nx generate-docs frontend --option1="foo" --option2="bar"

I'll remove it 👍

[jaysoo]

We can do that as a follow-up feature/PR where we do arguments forwarding.

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