customizable notification icon

### Before opening, please confirm:

- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-android/issues?q=is%3Aissue+) and [discussions](https://github.com/aws-amplify/amplify-android/discussions).

### Language and Async Model

Kotlin - Coroutines

### Amplify Categories

Notifications

### Gradle script dependencies

```groovy
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```

### Environment information

```
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```

### Please include any relevant guides or documentation you're referencing

_No response_

### Describe the feature request

**customizable notification icon**

pinpoint sdk use ic_launcher_foreground that is hardcoded in the [code](https://github.com/aws-amplify/amplify-android/blob/3e5e8695ffaaaba280fbffa19587b593442d97d7/aws-push-notifications-pinpoint-common/src/main/java/com/amplifyframework/pushnotifications/pinpoint/PushNotificationsUtils.kt#L133), so it cannot be customized on the app side.
There are cases where a different icon is needed for notifications, so I would like the ability to pass a different icon.

### Initialization steps (if applicable)

_No response_

### Code Snippet

```java
// Put your code below this line.

```

### amplifyconfiguration.json

_No response_

### GraphQL Schema

```graphql
// Put your schema below this line

```

### Additional information and screenshots

_No response_

Start in aws-push-notifications-pinpoint-common/src/main/java/com/amplifyframework/pushnotifications/pinpoint/PushNotificationsUtils.kt at the linked notification-icon code and trace how notification options reach it. Done means an app can provide a custom notification icon instead of the hardcoded ic_launcher_foreground, with the behavior covered by the relevant existing tests.

Written by the indexing model from the issue text.