Store: Introduce Standalone API for NgRx Store

[brandonroberts]

Information

Introduce standalone APIs for registering the Store and pieces of state for the @ngrx/store package. This should allow developers to use Store in a "module-free" application.

Based on the discussion in #3399 we are looking at adding two new functions

provideStore(reducerMap, rootConfig) - Registers the root-level providers for the global Store, and initial setup
provideState(reducerMap, featureConfig) - Registers additional features in the global Store

Also under consideration of whether we should separate the runtime checks from the provideStore() function so they can be tree-shaken in production builds

providers: [
  provideStore(),
  provideRuntimeChecks(config)
]

Related discussion: #3399

Describe any alternatives/workarounds you're currently using

Using importProvidersFrom function:

// main.ts
bootstrapApplication(AppComponent, {
  providers: [importProvidersFrom(StoreModule.forRoot({}))]
});

// feature.routes.ts:
export const featureRoutes: Route[] = [
  {
    path: '',
    component: FeatureComponent,
    providers: [importProvidersFrom(StoreModule.forFeature('name', reducer))],
  },
];

I would be willing to submit a PR to fix this issue

• Yes
• No

[yharaskrik]

@brandonroberts did you start this? 👀