Support --output-hashing for serve command

[dinony]

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

Desired functionality

build supports --prod and --output-hashing flags. It would be great if we could use the same flags for serve.

E.g.
ng serve --prod --output-hashing none

Also see issue.

[filipesilva]

ng serve --prod is already supported, and uses the production configuration in this target:

        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "latest-project:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "latest-project:build:production"
            }
          }
        },

The production configuration here says "use the production build options", which already includes all the production settings like output hashing.

If you have a custom configuration of options you need to use for building, you can add it as a new configuration inside the build target, then point at it from your serve target.

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