Support schematics in @nguniversal/express-engine

[vikerman]

• I'm submitting a ...

- [ ] bug report
- [x] feature request
- [ ] support request => Please do not submit support request here, see note at the top of this template.

• What modules are related to this Issue?

- [ ] aspnetcore-engine
- [ ] common
- [x] express-engine
- [] hapi-engine
- [ ] module-map-ngfactory-loader

• What is the current behavior?
  Copy and paste code to setup a working node server serving SSR app.

• What is the expected behavior?
  ng add @nguniversal/express-engine should

• Add the npm dependencies
• Create server.ts entry point for the the express engine based Node server
• Create webpack config to build server.ts
• (Optionally) Add entries into scripts of package.json with commands to build and run the SSR version of the app
• (Optionally) Provide ng g transfer-http to setup the HTTP cache transfer module

• What is the motivation / use case for changing the behavior?
  Make it easier to get started with Angular SSR

(Though we should probably display a warning that this is just a simplified setup and they would want to do something more tuned for production themselves)

[CaerusKaru]

The first draft of the Express Engine schematic is in #1051 and can be tracked there

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