Angular-cli: specify the `setup` option for webpack-dev-server in `serve` command

[royling]

Bug Report or Feature Request (mark with an x)

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

Versions.

Repro steps.

The log given by the failure.

Desired functionality.

able to specify the setup option for webpack-dev-server in serve command, similar to --proxy-config option.

Mention any other details that might be useful.

for the setup option of webpack-dev-server, refer to https://webpack.js.org/configuration/dev-server/#devserver-setup

[royling]

not sure if this aligns with the design principle of @angular/cli...
if this is acceptable, I can submit a PR.

[franktroia]

I would also find this very useful

[filipesilva]

This isn't something we're looking at doing for 1.x. It's a great candidate for the addon system coming in 2+ though.

[tBlabs]

+1

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