deploy multiple packages in parallel

[mshanemc]

see if this works, and build a command to promise.All them to speed up

Takes an array of non-dependent, non-sequential packageVersionIds.

[aheber]

I like it. I feel like each package install consumes the "deployment" slot in the org. I've never tried running them concurrently but could be amazing if it worked.

I'm pretty sure you can use the deployment status screen to monitor the package install progress which is why I feel like they run serially.