GeezerVison

…eNodeModulesArchitectHost

Add support for parsing multiple configurations in a single string using comma as a separator.

This support is only at the host level (`WorkspaceNodeModulesArchitectHost` in this case) and does not change the underlying Architect API.

Different hosts are able to compose target options in different ways.

It's now possible to use multiple configurations by separating them with a comma:
```
ng build --configuration=one,two,three
```

They will be applied from left to right. If `--prod` is also present, it will be considered to be the first configuration and thus able to be overriden.

You can also use it in target strings:
```
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "latest-project:build:one,two"
          },
          "configurations": {
            "production": {
              "browserTarget": "latest-project:build:production,one,two"
            }
          }
```

Fix angular#10612