Make <nz-root> component optional

[trotyl]

I'm submitting a...

[ ] Bug report  
[x] Feature request
[ ] Documentation issue or request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Support request => Please do not submit support request here

Current behavior

As suggested in doc, <nz-root> component must be listed at outermost layer of the app, which seems inconvenient for user.

Expected behavior

High-level goal:

Do not require <nz-root> in component template.

Detailed design:

• Add optional configuration param in forRoot() method.
• Introduce a separate InjectionToken for that configuration param.
• Use a dynamic component to apply global styles.
• Use a APP_INITIALIZER to apply font styles.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z

ng-zorro-antd version: X.Y.Z

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] IE version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[nikhilbangre]

when nzDrawerService Release.

[lock]

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