Allow ng serve to serve multiple applications at once

[ly-cultureiq]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [x] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

Repro steps

The log given by the failure

Desired functionality

Allow multiple apps to be served with ng serve
Webpack dev server supports multiple configurations already.
Currently the way command-runner is designed it only does the multiTarget consecutively, rather than allowing to run synchronously, which would allow for multiple webpack configs to be created and merged together for serve.

Mention any other details that might be useful

[rocketkittens]

Similar or duplicate issues:

#12107
#5072
#4624
#7954

[alan-agius4]

Hi @ly-cultureiq,

Thanks for this feature request. However, unfortunately currently this doesn't fall in the Angular CLI roadmap. Let's re-visit this in the future.

Thanks,
Alan

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