feat(toast): implement new shapes (#29936)

Issue number: internal

---------

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## What is the current behavior?
The shape of the toast component could not be customized.

## What is the new behavior?
- I have introduced a new shape property which determines whether the
toast widget has soft, round or rectangular corners.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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

packages/angular/standalone/src/directives/proxies.ts

@@ -2092,7 +2092,7 @@ export declare interface IonTitle extends Components.IonTitle {}
 
 @ProxyCmp({
   defineCustomElementFn: defineIonToast,
-  inputs: ['animated', 'buttons', 'color', 'cssClass', 'duration', 'enterAnimation', 'header', 'htmlAttributes', 'icon', 'isOpen', 'keyboardClose', 'layout', 'leaveAnimation', 'message', 'mode', 'position', 'positionAnchor', 'swipeGesture', 'theme', 'translucent', 'trigger'],
+  inputs: ['animated', 'buttons', 'color', 'cssClass', 'duration', 'enterAnimation', 'header', 'htmlAttributes', 'icon', 'isOpen', 'keyboardClose', 'layout', 'leaveAnimation', 'message', 'mode', 'position', 'positionAnchor', 'shape', 'swipeGesture', 'theme', 'translucent', 'trigger'],
   methods: ['present', 'dismiss', 'onDidDismiss', 'onWillDismiss']
 })
 @Component({
@@ -2100,7 +2100,7 @@ export declare interface IonTitle extends Components.IonTitle {}
   changeDetection: ChangeDetectionStrategy.OnPush,
   template: '<ng-content></ng-content>',
   // eslint-disable-next-line @angular-eslint/no-inputs-metadata-property
-  inputs: ['animated', 'buttons', 'color', 'cssClass', 'duration', 'enterAnimation', 'header', 'htmlAttributes', 'icon', 'isOpen', 'keyboardClose', 'layout', 'leaveAnimation', 'message', 'mode', 'position', 'positionAnchor', 'swipeGesture', 'theme', 'translucent', 'trigger'],
+  inputs: ['animated', 'buttons', 'color', 'cssClass', 'duration', 'enterAnimation', 'header', 'htmlAttributes', 'icon', 'isOpen', 'keyboardClose', 'layout', 'leaveAnimation', 'message', 'mode', 'position', 'positionAnchor', 'shape', 'swipeGesture', 'theme', 'translucent', 'trigger'],
   standalone: true
 })
 export class IonToast {