chore: clean up top-level package imports (#16514)

Cleans up all the remaining imports from the top-level `@angular/material` package.

guides/getting-started.md

@@ -33,7 +33,7 @@ yarn add angular/material2-builds angular/cdk-builds angular/animations-builds
 ```
 #### Alternative 2: Angular Devkit 6+
 
-Using the Angular CLI `ng add` command will update your Angular project with the correct dependencies, perform configuration changes and execute initialization code. 
+Using the Angular CLI `ng add` command will update your Angular project with the correct dependencies, perform configuration changes and execute initialization code.
 
 ```bash
 ng add @angular/material
@@ -72,7 +72,8 @@ export class PizzaPartyAppModule { }
 Import the NgModule for each component you want to use:
 
 ```ts
-import {MatButtonModule, MatCheckboxModule} from '@angular/material';
+import {MatButtonModule} from '@angular/material/button';
+import {MatCheckboxModule} from '@angular/material/checkbox';
 
 @NgModule({
   ...
@@ -85,7 +86,8 @@ export class PizzaPartyAppModule { }
 Alternatively, you can create a separate NgModule that imports and then re-exports all of the Angular Material components that you will use in your application. By exporting them again, other modules can simply include your `CustomMaterialModule` wherever Material components are needed, and automatically get all of the exported Material modules. A good place for importing/exporting the application-wide Material modules is the [SharedModule](https://angular.io/guide/ngmodule-faq#sharedmodule).
 
 ```ts
-import {MatButtonModule, MatCheckboxModule} from '@angular/material';
+import {MatButtonModule} from '@angular/material/button';
+import {MatCheckboxModule} from '@angular/material/checkbox';
 
 @NgModule({
   imports: [MatButtonModule, MatCheckboxModule],

src/a11y-demo/a11y-material-module.ts

@@ -8,35 +8,34 @@
 
 import {CdkTableModule} from '@angular/cdk/table';
 import {NgModule} from '@angular/core';
-import {
-  MatAutocompleteModule,
-  MatButtonModule,
-  MatButtonToggleModule,
-  MatCardModule,
-  MatCheckboxModule,
-  MatChipsModule,
-  MatDatepickerModule,
-  MatDialogModule,
-  MatExpansionModule,
-  MatGridListModule,
-  MatIconModule,
-  MatInputModule,
-  MatListModule,
-  MatMenuModule,
-  MatPaginatorModule,
-  MatProgressBarModule,
-  MatProgressSpinnerModule,
-  MatRadioModule,
-  MatSelectModule,
-  MatSidenavModule,
-  MatSliderModule,
-  MatSlideToggleModule,
-  MatSnackBarModule,
-  MatTableModule,
-  MatTabsModule,
-  MatToolbarModule,
-  MatTooltipModule,
-} from '@angular/material';
+import {MatAutocompleteModule} from '@angular/material/autocomplete';
+import {MatButtonModule} from '@angular/material/button';
+import {MatButtonToggleModule} from '@angular/material/button-toggle';
+import {MatCardModule} from '@angular/material/card';
+import {MatCheckboxModule} from '@angular/material/checkbox';
+import {MatChipsModule} from '@angular/material/chips';
+import {MatTableModule} from '@angular/material/table';
+import {MatDatepickerModule} from '@angular/material/datepicker';
+import {MatDialogModule} from '@angular/material/dialog';
+import {MatExpansionModule} from '@angular/material/expansion';
+import {MatGridListModule} from '@angular/material/grid-list';
+import {MatIconModule} from '@angular/material/icon';
+import {MatInputModule} from '@angular/material/input';
+import {MatListModule} from '@angular/material/list';
+import {MatMenuModule} from '@angular/material/menu';
+import {MatPaginatorModule} from '@angular/material/paginator';
+import {MatProgressBarModule} from '@angular/material/progress-bar';
+import {MatProgressSpinnerModule} from '@angular/material/progress-spinner';
+import {MatRadioModule} from '@angular/material/radio';
+import {MatSelectModule} from '@angular/material/select';
+import {MatSidenavModule} from '@angular/material/sidenav';
+import {MatSliderModule} from '@angular/material/slider';
+import {MatSlideToggleModule} from '@angular/material/slide-toggle';
+import {MatSnackBarModule} from '@angular/material/snack-bar';
+import {MatTabsModule} from '@angular/material/tabs';
+import {MatToolbarModule} from '@angular/material/toolbar';
+import {MatTooltipModule} from '@angular/material/tooltip';
+
 
 /**
  * NgModule that includes all Material modules that are required to serve the dev-app.

src/a11y-demo/button/button-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 @Component({

src/a11y-demo/card/card-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 @Component({

src/a11y-demo/chips/chips-a11y.ts

@@ -7,7 +7,8 @@
  */
 
 import {Component} from '@angular/core';
-import {MatChipInputEvent, MatSnackBar} from '@angular/material';
+import {MatChipInputEvent} from '@angular/material/chips';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 export interface Person {

src/a11y-demo/dialog/dialog-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatDialog} from '@angular/material';
+import {MatDialog} from '@angular/material/dialog';
 
 
 @Component({

src/a11y-demo/icon/icon-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 @Component({

src/a11y-demo/slide-toggle/slide-toggle-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 @Component({

src/a11y-demo/snack-bar/snack-bar-a11y.ts

@@ -7,7 +7,7 @@
  */
 
 import {Component} from '@angular/core';
-import {MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material/snack-bar';
 
 
 @Component({

src/a11y-demo/table/table-a11y.ts

@@ -6,9 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {DataSource} from '@angular/cdk/table';
 import {Component, OnInit, ViewChild} from '@angular/core';
-import {MatPaginator, MatSort} from '@angular/material';
+import {DataSource} from '@angular/cdk/table';
+import {MatSort} from '@angular/material/sort';
+import {MatPaginator} from '@angular/material/paginator';
 import {BehaviorSubject, merge, Observable} from 'rxjs';
 import {map} from 'rxjs/operators';
 

src/universal-app/kitchen-sink/kitchen-sink.ts

@@ -3,46 +3,40 @@ import {DragDropModule} from '@angular/cdk/drag-drop';
 import {ScrollingModule, ViewportRuler} from '@angular/cdk/scrolling';
 import {CdkTableModule, DataSource} from '@angular/cdk/table';
 import {Component, ElementRef, NgModule} from '@angular/core';
-import {
-  MatAutocompleteModule,
-  MatBadgeModule,
-  MatBottomSheet,
-  MatBottomSheetModule,
-  MatButtonModule,
-  MatButtonToggleModule,
-  MatCardModule,
-  MatCheckboxModule,
-  MatChipsModule,
-  MatDatepickerModule,
-  MatDialog,
-  MatDialogModule,
-  MatDividerModule,
-  MatExpansionModule,
-  MatFormFieldModule,
-  MatGridListModule,
-  MatIconModule,
-  MatInputModule,
-  MatListModule,
-  MatMenuModule,
-  MatNativeDateModule,
-  MatPaginatorModule,
-  MatProgressBarModule,
-  MatProgressSpinnerModule,
-  MatRadioModule,
-  MatRippleModule,
-  MatSelectModule,
-  MatSidenavModule,
-  MatSliderModule,
-  MatSlideToggleModule,
-  MatSnackBar,
-  MatSnackBarModule,
-  MatSortModule,
-  MatStepperModule,
-  MatTableModule,
-  MatTabsModule,
-  MatToolbarModule,
-  MatTooltipModule,
-} from '@angular/material';
+import {MatNativeDateModule, MatRippleModule} from '@angular/material/core';
+import {MatAutocompleteModule} from '@angular/material/autocomplete';
+import {MatButtonModule} from '@angular/material/button';
+import {MatButtonToggleModule} from '@angular/material/button-toggle';
+import {MatCardModule} from '@angular/material/card';
+import {MatCheckboxModule} from '@angular/material/checkbox';
+import {MatChipsModule} from '@angular/material/chips';
+import {MatTableModule} from '@angular/material/table';
+import {MatDatepickerModule} from '@angular/material/datepicker';
+import {MatDialogModule, MatDialog} from '@angular/material/dialog';
+import {MatExpansionModule} from '@angular/material/expansion';
+import {MatGridListModule} from '@angular/material/grid-list';
+import {MatIconModule} from '@angular/material/icon';
+import {MatInputModule} from '@angular/material/input';
+import {MatListModule} from '@angular/material/list';
+import {MatMenuModule} from '@angular/material/menu';
+import {MatPaginatorModule} from '@angular/material/paginator';
+import {MatProgressBarModule} from '@angular/material/progress-bar';
+import {MatProgressSpinnerModule} from '@angular/material/progress-spinner';
+import {MatRadioModule} from '@angular/material/radio';
+import {MatSelectModule} from '@angular/material/select';
+import {MatSidenavModule} from '@angular/material/sidenav';
+import {MatSliderModule} from '@angular/material/slider';
+import {MatSlideToggleModule} from '@angular/material/slide-toggle';
+import {MatSnackBarModule, MatSnackBar} from '@angular/material/snack-bar';
+import {MatTabsModule} from '@angular/material/tabs';
+import {MatToolbarModule} from '@angular/material/toolbar';
+import {MatTooltipModule} from '@angular/material/tooltip';
+import {MatBottomSheetModule, MatBottomSheet} from '@angular/material/bottom-sheet';
+import {MatBadgeModule} from '@angular/material/badge';
+import {MatDividerModule} from '@angular/material/divider';
+import {MatFormFieldModule} from '@angular/material/form-field';
+import {MatSortModule} from '@angular/material/sort';
+import {MatStepperModule} from '@angular/material/stepper';
 import {Observable, of as observableOf} from 'rxjs';
 
 export class TableDataSource extends DataSource<any> {