feat(scully runtime config): user forRoot to pass config to Scully

[SanderElias]

The transferState service now only gets activated when the config using forRoot says so.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/scullyio/scully/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Other... Please describe:

What is the current behavior?

transferStateService is always monitoring the route, and trying to load data, even when s/getState is not used at all.

What is the new behavior?

transferStateService is only monitoring if the user tells it so by using the config in forRoot
like this:

@NgModule({
  declarations: [AppComponent],
  imports: [
    BrowserModule,
    HttpClientModule,
    AppRoutingModule,
    ScullyLibModule.forRoot({useTranferState: true}),
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

Does this PR introduce a breaking change?

• Yes
• No

Other information

[jorgeucano]

I love it, but this is a breaking change if the people by default have false, we need add this into the document with the PR :)

[Villanuevand]

Im totally agree with @jorgeucano
We need to update the docs, and also release the new version ..

[SanderElias]

I changed the default to true so there is no breaking chance anymore.