ng g s: Add ability to generate non-singleton services

[am-trinity]

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

Versions

$ node --version
v10.8.0
$ npm --version
6.3.0
$ ng --version
Angular CLI: 6.0.7
Node: 10.8.0
OS: linux x64

Repro steps

ng g service example

The log given by the failure

New service not included in parent module with:

...
@Injectable({
  providedIn: 'root',
})
...

Desired functionality

New service without providedIn: 'root' attribute and included in parent module.

Mention any other details that might be useful

[hansl]

Hi @am-trinity ,

See discussion in #10170 (and many other places). Essentially Services are 99% singletons, and making a special case is actually more confusing for most users. It's a small change for you once the service is generated, so we decided to remove the option.

Please note that we never configured a provider in the past. We always created singleton services. I'm going to close this as working as intended.

Cheers!

[am-trinity]

I got it, thank you. Declarations like providedIn look very non-familiar and non-transparent (for the first time).

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