navigator.serviceWorker not available on iOS in-app browsers.

### Operating System

iOS 16.0

### Browser Version

in app browser, i can't see the version, browser that open when click a link on instagram for example.

### Firebase SDK Version

^9.22.2

### Firebase SDK Product:

Messaging

### Describe your project's tooling

Vue 3 app with Vite and Quasar in PWA mode

### Describe the problem

## The issue
When I import the `firebase/messaging` it executes the method `registerMessagingInWindow()` globally in the `packages/messaging/src/index.ts#45` and it's a problem because the `navigator.serviceWorker` don't exists in the in-app browser of iOS braking all the page.

## Workaround solution:
I'm importing dynamically the `firebase/messaging` like

```
export async function getToken (opt: { vapidKey: string }) {
const messagingModule = await import('firebase/messaging');
const messaging = messagingModule.getMessaging(app);

return messagingModule.getToken(messaging, { vapidKey: opt.vapidKey });
}
```

And I'm checking if the browser is in-app browser with:
```
const ua = navigator.userAgent || navigator.vendor || window.opera || '';
const inAppBrowser = /instagram|fbav|twitter|GSA|tiktok/i.test(ua);

if (inAppBrowser) {
return;
}
```

if it's an in-app browser i don't want to handle messaging cuz they don't should do it.

### Steps and code to reproduce issue

Just create any project with Webpack or Vite and import `firebase/messaging` in any place of your code statically and try to open this page in the iOS 16 in-app browser like Instagram or Google.

Start at packages/messaging/src/index.ts#45 and reproduce the static-import failure in an iOS 16 in-app browser using a Vite or Webpack app. Done means importing firebase/messaging no longer breaks the page when navigator.serviceWorker is unavailable, while supported browsers retain messaging behavior.

Written by the indexing model from the issue text.