refactor(schematics): Flag minimal is set to true (#2258)

Closes #2250

BREAKING CHANGES:

With this change by default the minimal setup for `@ngrx/store` will be generated.

BEFORE:

```
@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    StoreModule.forRoot(reducers, {
      metaReducers,
      runtimeChecks: {
        strictStateImmutability: true,
        strictActionImmutability: true
      }
    }),
    .....
  ],
  providers: [],
  bootstrap: [AppComponent]
})
```

AFTER:

```
@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    StoreModule.forRoot({})
    ....
  ],
  providers: [],
  bootstrap: [AppComponent]
})
```

modules/store/schematics/ng-add/index.spec.ts

@@ -2,7 +2,6 @@ import {
   SchematicTestRunner,
   UnitTestTree,
 } from '@angular-devkit/schematics/testing';
-import { getFileContent } from '@schematics/angular/utility/test';
 import * as path from 'path';
 import { Schema as RootStoreOptions } from './schema';
 import {
@@ -19,6 +18,7 @@ describe('Store ng-add Schematic', () => {
     skipPackageJson: false,
     project: 'bar',
     module: 'app',
+    minimal: false,
   };
 
   const projectPath = getTestProjectPath();

modules/store/schematics/ng-add/schema.json

@@ -40,7 +40,7 @@
     },
     "minimal": {
       "type": "boolean",
-      "default": false,
+      "default": true,
       "description":
         "Setup state management without registering initial reducers."
     }

projects/ngrx.io/content/guide/store/install.md

@@ -29,14 +29,24 @@ ng add @ngrx/store
 * path - path to the module that you wish to add the import for the `StoreModule` to.
 * project - name of the project defined in your `angular.json` to help locating the module to add the `StoreModule` to.
 * module - name of file containing the module that you wish to add the import for the `StoreModule` to. Can also include the relative path to the file. For example, `src/app/app.module.ts`;
-* minimal - flag to only provide minimal setup for the root state management. Only registers `StoreModule.forRoot()` in the provided `module` with an empty object, and default runtime checks.
+* minimal - By default true, flag to only provide minimal setup for the root state management. Only registers `StoreModule.forRoot()` in the provided `module` with an empty object, and default runtime checks.
 * statePath - The file path to create the state in. By default, this is `reducers`.
 * stateInterface - The type literal of the defined interface for the state. By default, this is `State`.
 
 This command will automate the following steps:
 
 1. Update `package.json` > `dependencies` with `@ngrx/store`.
-2. Run `npm install` to install those dependencies. 
+2. Run `npm install` to install those dependencies.
+3. Update your `src/app/app.module.ts` > `imports` array with `StoreModule.forRoot({})`.
+
+```sh
+ng add @ngrx/store --minimal false
+```
+
+This command will automate the following steps:
+
+1. Update `package.json` > `dependencies` with `@ngrx/store`.
+2. Run `npm install` to install those dependencies.
 3. Create a `src/app/reducers` folder, unless the `statePath` flag is provided, in which case this would be created based on the flag.
 4. Create a `src/app/reducers/index.ts` file with an empty `State` interface, an empty `reducers` map, and an empty `metaReducers` array. This may be created under a different directory if the `statePath` flag is provided.
 5. Update your `src/app/app.module.ts` > `imports` array with `StoreModule.forRoot(reducers, { metaReducers })`. If you provided flags then the command will attempt to locate and update module found by the flags.