Make standalone import the default

Since Angular now defaults to standalone component, it only make sense for ionic imports to be standalone by default.

It gets tedious to type something like:

```ts
import { Config } from '@ionic/angular/standalone';
```

vs

```ts
import { Config } from '@ionic/angular/';
```

Make NgModule based apps use:

```ts
import { Config } from '@ionic/angular/ngmodule';
```