docs-bug(MatDialog): Document standalone import

### Documentation Feedback

TLDR; would be nice to document how to provide dialog and snackbar for standalone components.
I don't want to provide MatDialogModule for every standalone component that uses a dialog.

I guess I could add it to main.ts. I have a convenience service that does alert(), confirm(), error() dialogs and hides the MatDialogModule from simple components. I don't have a great way of providing MatDialogModule for this convenience service.

in the [docs](https://material.angular.io/components/dialog/api) it says:

`import {MatDialogModule} from '@angular/material/dialog';`

now that i'm using standalone components,
is it recommend to use:
`importProvidersFrom(MatDialogModule),`
in main.ts

e.g.

```

bootstrapApplication(AppComponent, {
providers: [
// https://this-is-angular.github.io/angular-guides/docs/standalone-apis/configuring-the-router-using-standalone-features
provideRouter(
routes,
withDebugTracing()),
importProvidersFrom(HttpClientModule),
importProvidersFrom(MatDialogModule),
provideAnimations(),
]
}).catch(err => console.error(err));

```

I guess it wouldn't make sense to provide MatDialogModule to the convenience service separately to how I provide it to some standalone components, as then perhaps the app would have inconsistent dialogs, so in main.ts makes sense, just feels disorganised.

### Affected documentation page

https://material.angular.io/components/dialog/api

p.s

also worth mentioning, fyi, sometimes we have to explicitly import our components to avoid errors, but we don't have any entrypoints or anything:

```

async serviceMethodThatOpensDialog(
) {
const { SparkplugbDatapointBulkCreateComponent } = await import('../datapoint-sparkplugb/sparkplugb-datapoint-bulk-create/sparkplugb-datapoint-bulk-create.component'
)
return this.dialog.open(SparkplugbDatapointBulkCreateComponent, {
data: {
}
})
}

```

https://material.angular.io/components/dialog/api の該当する Dialog API ドキュメントページから始め、現在 MatDialogModule がどのように記載されているかを確認してください。Issue では、standalone コンポーネントに dialog と snackbar のサービスを提供する方法についてのガイダンスを求めています。ドキュメントで standalone アプリに推奨されるアプローチを説明できれば完了です。

索引モデルが issue の本文から書いたものです。