fix(angular): export missing lifecycle interfaces for standalone package (#28346)

Issue number: N/A

Resolves feedback identified here:
baa37ef1e3 (r1356414362)

---------

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## What is the current behavior?
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The lifecycle interfaces are not exported from
`@ionic/angular/standalone`.

## What is the new behavior?
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this PR. -->

- Lifecycle interfaces are exported from `@ionic/angular/standalone`.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

packages/angular/standalone/src/index.ts

@@ -22,6 +22,10 @@ export {
   Platform,
   NavParams,
   IonicRouteStrategy,
+  ViewWillEnter,
+  ViewDidEnter,
+  ViewWillLeave,
+  ViewDidLeave,
 } from '@ionic/angular/common';
 export { IonNav } from './navigation/nav';
 export {