[FR]: FCM support for multiple tokens

### Description

1. If I want to send a [Location Push](https://developer.apple.com/documentation/corelocation/creating_a_location_push_service_extension) to iOS, I have to use a separate APNS token for that.
2. FCM currently does not have support for multiple, different tokens?
3. Maybe FCM should have some kind of abstraction for different types of tokens?

Also see: https://stackoverflow.com/questions/77332100/problem-with-fcm-firebase-notifications-and-multiple-apns-tokens-from-the-same

### API Proposal

_No response_

### Firebase Product(s)

Messaging