Function initializeInAppMessaging

initializeInAppMessaging(): void
Initialize and set up in-app messaging category. This API needs to be called to enable other InAppMessaging APIs.

Returns void
Deprecated
AWS will end support for Amazon Pinpoint on October 30, 2026.

Remarks
Make sure to call this early in your app at the root entry point after configuring Amplify.

Example
```
Amplify.configure(config);
initializeInAppMessaging();
```